<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                ----------------

   
                                  FORM 10-Q/A

                               AMENDMENT NO.1 TO
    

          QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934


 (X)  Quarterly Report Pursuant to Section 13 or 15(d) of the Securities 
      Exchange Act of 1934

                                       OR

 (  ) Transition Report Pursuant to Section 13 or 15(d) of the Securities
      Exchange Act of 1934

                  ---------------------------------------------

 FOR THE QUARTER ENDED OCTOBER 31, 1998           COMMISSION FILE NUMBER 0-25016


                                  T-NETIX, INC.
             ------------------------------------------------------
             (Exact Name of registrant as Specified in Its Charter)


<TABLE>
<CAPTION>
                  COLORADO                                                     84-1037352
-----------------------------------------------                   -----------------------------------
<S>                                                               <C>
(State of Other Jurisdiction of Incorporation)                    (I.R.S. Employer Identification No.)
</TABLE>


            67 INVERNESS DRIVE EAST
              ENGLEWOOD, COLORADO                            80112
     ---------------------------------------              ----------
     (Address of principal executive offices)             (Zip Code)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (303) 790-9111

      --------------------------------------------------------------------


     Indicate by check X whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15 (d) of the Securities and Exchange Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days Yes ( X ) No ( )

     Indicate the number of shares outstanding of each of the issuer's classes
of common stock, as of the latest practicable date.

               Class                           Outstanding at December 10, 1998
-------------------------------                --------------------------------
Common Stock, $.01 stated value                           8,553,292


<PAGE>   2


                                  T-NETIX, INC.
                                    FORM 10-Q

                                      INDEX



<TABLE>
<CAPTION>
PART     ITEM                                                                                          PAGE
----     ----                                                                                          ----
<S>     <C>                                                                                            <C>
I.       FINANCIAL INFORMATION

         1. Financial Statements:

                  Consolidated Balance Sheets, October 31, 1998
                           and July 31, 1998 (Unaudited)..............................................   2

                  Consolidated Statements of Operations, Three Months Ended
                           October 31, 1998 and 1997 (Unaudited) .....................................   3

                  Consolidated Statements of Shareholders' Equity, Three Months Ended
                           October 31, 1998 and Year Ended July 31, 1998 (Unaudited) .................   4

                  Consolidated Statements of Cash Flows, Three Months Ended
                           October 31, 1998 and 1997 (Unaudited) .....................................   5

                  Notes to Consolidated Financial Statements (Unaudited)..............................   6

         2. Management's Discussion and Analysis of Financial Condition and Results of
                  Operations..........................................................................   9

II.      OTHER INFORMATION - Items 1 through 6 .......................................................  16
</TABLE>



                                       1
<PAGE>   3


                         PART I - FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

                         T-NETIX, INC. AND SUBSIDIARIES
                           Consolidated Balance Sheets
                                   (Unaudited)

   
<TABLE>
<CAPTION>
                                                                                         October 31,             July 31,
                                                                                             1998                  1998
                                                                                         -----------             ---------
                                                                                             (amounts in thousands)
<S>                                                                                 <C>                    <C>
ASSETS

Cash and cash equivalents                                                           $              633     $              415
Accounts receivable, net of allowance                                                           13,419                 10,293
Prepaid expenses                                                                                   488                    487
                                                                                      -------------------    ------------------
          Total current assets                                                                  14,540                 11,195
Investment                                                                                       1,935                  1,343
Property and equipment, at cost:
  Telecommunications equipment                                                                  43,154                 42,435
  Construction in progress                                                                       3,822                  3,163
  Office equipment                                                                               5,131                  4,937
                                                                                      -------------------    ------------------
    Property and equipment                                                                      52,107                 50,535
  Less accumulated depreciation and amortization                                               (26,499)               (24,756)
                                                                                      -------------------    ------------------
    Property and equipment, net                                                                 25,608                 25,779
Patent license rights                                                                            1,960                  2,085
Software development costs, net                                                                  1,779                  1,458
Other assets, net                                                                                2,809                  2,813
                                                                                      -------------------    ------------------
                                                                                    $           48,631     $           44,673
                                                                                      ===================    ==================

LIABILITIES AND SHAREHOLDERS' EQUITY

Liabilities:
  Accounts payable                                                                  $            2,515     $            2,772
  Accrued liabilities                                                                            2,402                  2,628
  Debt                                                                                          15,244                 10,803
                                                                                      -------------------    ------------------
          Total current liabilities                                                             20,161                 16,203
Long term debt                                                                                     357                     --
                                                                                      -------------------    ------------------
          Total liabilities                                                                     20,518                 16,203
                                                                                      -------------------    ------------------
Shareholders' equity:
  Preferred stock, $0.01 stated value, 10,000,000 shares
    authorized; no shares issued                                                                    --                     --
  Common stock, $0.01 stated value, 70,000,000 shares
    authorized; issued and outstanding 8,550,632 and 8,544,507
    shares, respectively                                                                            85                     85
  Additional paid-in capital                                                                    27,954                 27,925
  Retained earnings                                                                                 74                    460
                                                                                      -------------------    ------------------
        Total shareholders' equity                                                              28,113                 28,470
Commitments and contingencies
                                                                                      -------------------    ------------------
                                                                                    $           48,631     $           44,673
                                                                                      ===================    ==================
</TABLE>
    

See accompanying notes to consolidated financial statements.



                                       2


<PAGE>   4



                         T-NETIX, INC. AND SUBSIDIARIES
                      Consolidated Statements of Operations
                                   (Unaudited)


<TABLE>
<CAPTION>
                                                                             Three Months Ended
                                                                 -------------------------------------------
                                                                    October 31,           October 31,
                                                                       1998                   1997
                                                                 ------------------  -----------------------
                                                                        (amounts in thousands, except 
                                                                              per share amounts)
<S>                                                           <C>                  <C>
Revenue:
  Telecommunication services                                  $            8,107   $             8,803
  Telecommunication licensing                                                 47                    46
  Direct call provisioning                                                   920                   506
  Voice print                                                                115                   380
                                                                 -----------------     --------------------
      Total revenue                                                        9,189                 9,735

Expenses:
  Operating costs and expenses
    Telecommunications services                                            4,098                 3,963
    Direct call provisioning                                                 860                   482
    Voice print                                                               15                    33
                                                                 -----------------     --------------------
        Total operating costs and expenses                                 4,973                 4,478
  Selling, general, and administrative                                     2,153                 1,863
  Research and development                                                   482                   582
  Depreciation and amortization                                            1,988                 2,148
                                                                 -----------------     --------------------
        Total expenses                                                     9,596                 9,071

        Operating income (loss)                                             (407)                  664

Interest expense                                                            (236)                 (270)
                                                                 -----------------     --------------------

        Earnings (loss) before income taxes                                 (643)                  394

Income taxes                                                                 257                   (99)
                                                                 -----------------     --------------------

        Net earnings (loss)                                   $             (386)  $               295
                                                                 =================     ====================

Basic earnings (loss) per common share                        $            (0.05)  $              0.03
                                                                 =================     ====================
Diluted earnings (loss) per common share                      $            (0.05)  $              0.03
                                                                 =================     ====================

Weighted average common shares
  outstanding - basic                                                      8,549                 8,449
                                                                 =================     ====================
Weighted average common shares
  outstanding- diluted                                                     8,549                 9,089
                                                                 =================     ====================
</TABLE>

See accompanying notes to consolidated financial statements.



                                       3
<PAGE>   5

                         T-NETIX, INC. AND SUBSIDIARIES
                 Consolidated Statements of Shareholders' Equity
                                   (Unaudited)

<TABLE>
<CAPTION>
                                      
                                                     Common stock            Additional      Retained          Total
                                              -------------------------       paid-in        earnings      shareholders'
                                                 Shares        Amounts        capital       (deficit)          equity
                                              ------------    ---------      ----------    -----------     -------------
                                                                            (amounts in thousands)
<S>                                             <C>           <C>            <C>           <C>               <C>
Balances at August 1, 1997                       8,314        $     83       $  26,908     $    (139)        $  26,852

Common stock issued upon
   exercise of stock options                       230               2             819            --               821
Stock option tax benefit                            --              --             198            --               198
Net earnings                                        --              --              --           599               599
                                              -------------    -----------    ----------    ----------        ----------

Balances at July 31, 1998                        8,544              85          27,925           460            28,470

Common stock issued upon
   exercise of stock options                         6              --              29            --                29
Net loss                                            --              --              --          (386)             (386)
                                              -------------    -----------    ----------    ----------        ----------

Balances at October 31, 1998                     8,550        $     85       $  27,954     $      74         $  28,113
                                              =============    ===========    ==========    ==========        ==========
</TABLE>

See accompanying notes to consolidated financial statements.



                                       4
<PAGE>   6


                         T-NETIX, INC. AND SUBSIDIARIES
                      Consolidated Statements of Cash Flows
                  Three months ended October 31, 1998 and 1997
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                                        1998                      1997
                                                                                 ---------------------    -----------------
                                                                                            (amounts in thousands)
<S>                                                                            <C>                        <C>
Cash flows from operating activities:
  Net earnings (loss)                                                          $             (386)        $              295
  Adjustments to reconcile net earnings to net cash
    provided by (used in) operating activities:
    Depreciation and amortization                                                           1,988                      2,148
    Provision for losses on accounts receivable                                               404                        152
    Deferred tax expense (benefit)                                                           (257)                        99
    Changes in operating assets and liabilities, net of acquisition 
      of business:
        Change in accounts receivable                                                      (3,530)                    (1,768)
        Change in prepaid expenses                                                             (1)                      (234)
        Change in other assets                                                                (63)                       (39)
        Change in accounts payable                                                           (257)                       397
        Change in accrued liabilities                                                          31                         69
                                                                                 --------------------       ------------------

        Cash provided by operating activities                                              (2,071)                     1,119
                                                                                 --------------------       ------------------

Cash flows from investing activities:
  Capital expenditures                                                                     (1,068)                    (1,635)
  Other investing activities                                                                 (956)                      (192)
                                                                                 --------------------       ------------------

        Cash used in investing activities                                                  (2,024)                    (1,827)
                                                                                 --------------------       ------------------

Cash flows from financing activities:
  Proceeds from borrowings                                                                  4,301                        295
  Payments of debt                                                                            (17)                      (214)
  Common stock issued for cash under option plans                                              29                        634
                                                                                 --------------------       ------------------

        Cash provided by financing activities                                               4,313                        715
                                                                                 --------------------       ------------------

Net decrease in cash and cash equivalents                                                     218                          7

Cash and cash equivalents at beginning of period                                              415                        190
                                                                                 --------------------       ------------------

Cash and cash equivalents at end of period                                     $              633         $              197
                                                                                 ====================       ==================
</TABLE>

See accompanying notes to consolidated financial statements.



                                       5


<PAGE>   7



                         T-NETIX, INC. AND SUBSIDIARIES
                   Notes to Consolidated Financial Statements

Unaudited financial statements

The accompanying unaudited consolidated financial statements reflect all
adjustments which, in the opinion of management, are necessary to reflect a fair
presentation of the financial position and results of operations of T-NETIX,
Inc. and subsidiaries (the Company) for the interim periods presented. All
adjustments, in the opinion of management, are of a normal and recurring nature.

Reclassification

Certain amounts in the 1997 financial statements have been reclassified to
conform with the 1998 presentation.

   
Revenue Recognition

In October 1997, the AICPA issued Statement of Position (SOP) 97-2, Software 
Revenue Recognition, which supersedes SOP 91-1. The provisions of SOP 97-2 have 
been applied to transactions entered into after July 31, 1998. Prior to that 
date, the Company's revenue recognition policy was in accordance with SOP No. 
91-1.

SOP 97-2 generally requires revenue earned on software arrangements involving
multiple elements (i.e. software products, upgrades/enhancements, postcontract
customer support, installation, training, etc.) to be allocated to each element
based on the relative fair value of the elements. The fair value of an element
must be based on evidence, which is specific to the vendor. The revenue
allocated to software products (including specified upgrades/enhancements)
generally is recognized upon delivery of the products. The revenue allocated to
postcontract customer support generally is recognized ratably over the term of
the support and revenue allocated to service elements (such as training and
installation) generally is recognized as the services are performed. If a vendor
does not have evidence of the fair value for all elements in a multiple-element
arrangement, all revenue from the arrangement is deferred until such evidence
exists or until all elements are delivered. There was no material impact on the
Company's results of operations as a result of the adoption of SOP 97-2.
    

Research and development

Costs associated with the research and development of new technology or
significantly altering existing technology are charged to operations as
incurred.

   
Software development costs have been accounted for in accordance with Statement
of Financial Accounting Standards No. 86, Accounting for the Costs of Computer
Software to be Sold, Leased or Otherwise Marketed. Under the standard,
capitalization of software development costs begins upon the establishment of
technological feasibility, subject to net realizable value considerations.
Capitalized software costs are amortized over the greater of: 1) the amount
compared using the ratio that current gross revenues for a product bear to the
total of current and anticipated future gross revenues for that product; or 2)
the straight line method over the remaining estimated useful life of the product
which life is generally estimated to be three years. The Company capitalized
$364,000 in software development costs for the three months ended October 31,
1998.
    

Earnings (loss) per common share

Earnings per common share for the three months ended October 31, 1998 and 1997,
are presented in accordance with the provisions of Statement of Financial
Accounting Standards No. 128, Earnings Per Share (SFAS 128). SFAS 128 replaced
the presentation of primary and fully diluted earnings per share (EPS), with a
presentation of basic EPS and diluted EPS. Under SFAS 128, basic EPS excludes
dilution for common stock equivalents and is computed by dividing income or loss
available to common shareholders by the weighted average number of common shares
outstanding during the period. Diluted EPS reflects the potential dilution that
could occur if securities or other contracts to issue common stock were
exercised or converted into common stock. For the three months ended October 31,
1998 common stock equivalents were not included in the diluted EPS calculation
as they would be anti-dilutive. For the three months ended October 31, 1997,
diluted common and common equivalent shares outstanding includes 641,000 of
common share equivalents, consisting of stock options, determined under the
treasury stock method.

Income taxes

The Company tax provision for the three months ended October 31, 1998 and 1997
was calculated using the estimated effective tax rate for the fiscal year.



                                       6
<PAGE>   8


                         T-NETIX, INC. AND SUBSIDIARIES
                   Notes to Consolidated Financial Statements


Supplemental disclosure to Statements of Cash Flows

During the three months ended October 31, 1998, the Company financed certain
capital expenditures for computer software licenses totaling $515,000 through
the issuance of a capital lease.

Segment Information

The Company operates in two business segments; inmate calling services and
SpeakEZ Voice Printsm . The Company evaluates performance based on earnings
(loss) before income taxes. Additional measures include operating income,
depreciation and amortization, and interest expense. There are no intersegment
sales. The Company's reportable segments are specific business units that offer
different products and services. They are managed separately because each
business requires different technology and marketing strategies. Segment
information for the three months ended October 31, 1998 and 1997 are as follows:

<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED OCTOBER 31, 1998
                                              ----------------------------------------------------
                                              INMATE CALLING
                                                 SERVICES           SPEAKEZ              TOTAL
                                              --------------      -----------         ------------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                             <C>                  <C>                 <C>
     Revenue from external customers......      $ 9,074             $   115             $ 9,189
     Operating income (loss)..............          698              (1,105)               (407)
     Depreciation and amortization........        1,759                 229               1,988
     Interest expense.....................           61                 175                 236
     Segment earnings (loss) before taxes.          637              (1,280)               (643)
</TABLE>

<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED OCTOBER 31, 1997
                                              ----------------------------------------------------
                                              INMATE CALLING
                                                 SERVICES           SPEAKEZ              TOTAL
                                              --------------      -----------         ------------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                            <C>                  <C>                 <C>
     Revenue from external customers......       $ 9,355           $    380              $ 9,735
     Operating income (loss)..............         1,452               (788)                 664
     Depreciation and amortization........         1,885                263                2,148
     Interest expense.....................           121                149                  270
     Segment earnings (loss) before taxes.         1,331               (937)                 394
</TABLE>

   
There was no intersegment revenue for the three months ended October 31, 1998
and 1997. Unallocated amounts to reflect net earnings included income tax
expense (benefit) of $(257,000) and $99,000 for the three months ended October
31, 1998 and 1997, respectively. Consolidated total assets included eliminations
of $13,358,000 and $12,509,000 as of October 31, 1998 and July 31, 1998,
respectively. Eliminations consist of intercompany receivables in the ICS 
Division and intercompany payables in the SpeakEZ Division related solely to the
intercompany borrowing of the SpeakEZ Division.
    



                                       7
<PAGE>   9



Subsequent Events

In December 1998, the Company began an evaluation of the SpeakEZ Division and
determined the best course of action was to consolidate its research and
development operations into its corporate operations. The Company intends to
complete this consolidation by January 31, 1999. The evaluation also addressed
the future marketing strategy of the SpeakEZ Division and determined that the
marketing would move away from a direct customer sales strategy to a technology
based licensing strategy. Due to this change in focus, forecasted revenue for
certain SpeakEZ software products was significantly decreased. As a result, the
balance of the remaining costs for certain software products is believed to
exceed their net realizable value. The Company believes it will incur a charge
for a reduction in net realizable of these assets. The assets had a net book
value of approximately $719,000 at October 31, 1998. The Company currently
estimates that approximately 60% of the value of these assets could be subject
to impairment. In addition, as a result of the evaluation, the Company will be
required to evaluate an investment made with a venture partner for $300,000
which may be subject to impairment.

In December, 1998, the Company entered into an agreement with Cell-Tel
Monitoring, Inc. ("Cell-Tel") to extend its option to purchase 100% of the
common stock of Cell-Tel until January 1999.

Effective December 1998, the Company changed its fiscal year ended July 31 to
fiscal year ended December 31. The Company plans to report a five month
transition period ending December 31, 1998.



                                       8


<PAGE>   10



ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS


For a comprehensive understanding of the Company's financial condition and
performance, this discussion should be considered within the context of the
consolidated financial statements and accompanying notes and other information
contained herein.

The Private Securities Litigation Reform Act of 1995 provides a "safe harbor"
for forward-looking statements. Certain information contained in management's
discussion and analysis of financial condition and results of operations and
elsewhere in this Form 10-Q include forward-looking statements that involve
risks and uncertainties not limited to, the demand for the Company's products
and services and market acceptance risks which may affect the potential
technological obsolescence of existing systems, the renewal of existing site
specific customer contracts, the ability to retain the base of current site
specific customer contracts, the continued relationship with existing customers,
the effect of economic conditions, the effect of regulation, including the
Telecommunications Act of 1996, the effect of the Year 2000 Issue, the impact of
competitive products and pricing, the Company's continuing ability to develop
hardware and software products, commercialization and technological
difficulties, manufacturing capacity and product supply constraints or
difficulties, actual purchases by current and prospective customers under
existing and expected agreements, the progress of contract implementation
efforts that allow the Company to recognize revenue under its accounting
policies, and the results of financing efforts, along with the other risks
detailed herein.

OVERVIEW

INMATE CALLING SERVICES DIVISION

The Company derives revenue under contracts with its customers, including AT&T,
Bell Atlantic, U S WEST, SBC Communications, BellSouth, MCI WorldCom and GTE,
and other telecommunications service providers, primarily from the provisioning
of specialized call processing services for correctional facilities. This
revenue is generated under long-term contracts which provide for transaction
fees paid on a per-call basis. The Company is paid a prescribed fee for each
call completed and additional fees for validating phone numbers dialed by
inmates. The Company also derives revenue as a direct provider of inmate calls.
The following table sets forth certain information concerning the accepted calls
processed by the Company for its customers in the inmate calling market and
excludes direct call provisioning.

<TABLE>
<CAPTION>
                                                Three Months Ended
                                      -----------------------------------------
                                         October 31,           October 31,
                                             1998                  1997
                                      -------------------   -------------------
<S>                                   <C>                   <C>
Call volumes processed                        21,913,000            23,500,000

Average daily transactions                       238,000               255,000
</TABLE>

The Company had an net reduction in call volume. The net reduction in call
volumes is a result of reductions as a result of non-renewal of existing site
specific customers contracts in competitive bidding arrangements, prisoner
relocation programs, and increased use of call control measures by correctional
institutions. These factors were partially offset by increases associated with
the addition of new call processing systems. The Company will continue to market
its services to additional call providers; however, it expects growth in call
processing volumes will come predominantly from adding new systems for existing
customers.

SPEAKEZ DIVISION

In December 1998, the Company began an evaluation of the SpeakEZ Division and
determined the best course of action was to consolidate its research and
development operations into its corporate operations. The Company intends to
complete this consolidation by January 31, 1999. The evaluation also addressed



                                       9
<PAGE>   11

the future marketing strategy of the SpeakEZ Division and determined that the
marketing would move away from a direct customer sales strategy to a technology
based licensing strategy. Due to this change in focus, forecasted revenue for
certain SpeakEZ software products was significantly decreased. As a result, the
balance of the remaining costs for certain software products is believed to
exceed their net realizable value. The Company believes it will incur a charge
for a reduction in net realizable of these assets. The assets had a net book
value of approximately $719,000 at October 31, 1998. The Company currently
estimates that approximately 60% of the value of these assets could be subject
to impairment. In addition, as a result of the evaluation, the Company will be
required to evaluate an investment made with a venture partner for $300,000
which may be subject to impairment.

The Company believes that its change in marketing and development strategies for
the SpeakEZ Voice Printsm technology will not result in near term revenue
exceeding historical quarterly amounts, however management believes that the
change in strategy may result in expanded opportunities in the future. However,
there can be no assurance that these products will achieve the necessary market
acceptance or become widely adopted. The market for speaker verification
software has only recently begun to develop. As is typical in the case of a new
and rapidly evolving market, demand and market acceptance for recently
introduced products and services are subject to a high level of uncertainty.
Voice print revenue for the Company has been minimal to date. There is no
assurance that these products will be commercially accepted or profitable in the
future.



                                       10
<PAGE>   12

RESULTS OF OPERATIONS

Three Months Ended October 31, 1998 and 1997

         The following table sets forth certain statement of operations data as
a percentage of total revenue for the three months ended October 31, 1998 and
1997.
<TABLE>
<CAPTION>
                                                                                   THREE MONTHS ENDED OCTOBER 31,
                                                                                   ------------------------------
                                                                                        1998             1997
                                                                                        ----             ----
<S>                                                                                     <C>              <C>
Revenue:
   Telecommunications services..................................................           88%            90%
   Telecommunications licensing.................................................            1              1
   Direct call provisioning.....................................................           10              5
   Voice print    ..............................................................            1              4
                                                                                          ---            ---
       Total revenue............................................................          100            100

Expenses:
   Operating costs and expenses.................................................           54             47
   Selling, general and administrative..........................................           23             19
   Research and development.....................................................            5              6
   Depreciation and amortization................................................           22             21
                                                                                          ---            ---
     Operating income (loss) ...................................................           (4)             7
   Interest expense.............................................................           (3)            (3)
                                                                                          ---            ---
     Earnings (loss) before income taxes........................................           (7)             4
   Income taxes   ..............................................................            3             (2)
                                                                                          ---            ---
     Net earnings (loss) .......................................................           (4)%            2%
                                                                                          ===            ===
</TABLE>

Total Revenue. Total revenue decreased 6% to $9,189,000 for the three months
ended October 31, 1998, from $9,735,000 for the prior year. This decrease
resulted from decreases in telecommunications services revenue and voice print
revenue, offset by an increase in direct call provisioning revenue. The 8%
decrease in telecommunications services revenue to $8,107,000 for the three
months ended October 31, 1998, from $8,803,000 in the prior year, was primarily
due to a 6% decrease in call volume. The net reduction in call volumes is a
result of reductions as a result of non-renewal of existing site specific
customers contracts in competitive bidding arrangements, prisoner relocation
programs, and increased use of call control measures by correctional
institutions. These factors were partially offset by increases associated with
the addition of new call processing systems. The Company does not expect
significant contribution from telecommunications licensing revenue in the near
future.

Direct call provisioning revenue increased 82% to $920,000 for the three months
ended October 31, 1998 from $506,000 for the prior period. This increase was due
to the addition of sites in which the Company is provisioning the long distance
service. The Company's ability to increase direct call provisioning revenue in
the future is tied, in part, to the continued provisioning the long distance
service on certain site contracts. There can be no assurance that the Company
will be successful in increasing the number of sites serviced. The Company also
recognized SpeakEZ Voice Printsm revenue in the amount of $115,000 for the three
months ended October 31, 1998 or a decrease of $265,000 from the corresponding
prior period. SpeakEZ Voice Printsm revenue was derived primarily from the
provisioning of services and for the sale of software licenses and hardware
systems, and software development kits. Approximately $52,000 of the SpeakEZ
revenue for the quarter ended October 31, 1998 was for a government project that
will end in November 1998. Future amounts of voice print revenue are
unpredictable and depend upon market acceptance, technological success, and
impact of new competition.

Operating costs and expenses. Total operating costs and expenses increased to
$4,973,000 for the three months ended October 31, 1998, from $4,478,000 for the
corresponding prior period, and increased as a percentage of total revenue to
54% for the three months ended October 31, 1998 from 46% for the corresponding
prior period. The increase in operating costs and expenses was due primarily to

                                       11

<PAGE>   13

the inclusion of a greater amount of direct call provisioning expenses and an
overall change in the revenue mix to include a greater portion of direct call
provisioning revenue and expenses and a lesser amount of telecommunications
services revenue and expenses. Operating costs and expenses of
telecommunications services primarily consist of service administration costs
for correctional facilities, including salaries and related personnel expenses,
communication costs and inmate calling systems repair and maintenance expense.
Operating costs and expenses of telecommunications services also include costs
associated with call verification procedures, primarily network expenses and
database access charges. The Company invoices these verification procedure costs
to its customers with minimal margins. There were minimal costs directly
associated with telecommunications licensing revenue. Operating costs and
expenses associated with direct call provisioning include the costs associated
with telephone line access, long distance charges, commissions paid to
correctional facilities, costs associated with uncollectible accounts and
billing charges. Voice print operating costs for the three months ended October
31, 1998 include the cost of hardware systems sold, installation costs, and
royalty charges.

         The following table sets forth the operating costs and expenses for
each type of revenue as a percentage of corresponding revenue for the three
months ended October 31, 1998 and 1997.

<TABLE>
<CAPTION>
                                                                                    THREE MONTHS ENDED OCTOBER 31,
                                                                                    ------------------------------
                                                                                         1998             1997
                                                                                         ----             ----
<S>                                                                                      <C>              <C>
Operating costs and expenses:
  Telecommunications services.......................................................       51%             45%
  Direct call provisioning..........................................................       94              95
  Voice print     ..................................................................       13              24
</TABLE>

Operating costs and expenses associated with providing telecommunications
services increased as a percentage of corresponding revenue to 51% for the three
months ended October 31, 1998, from 45% in the corresponding prior period. The
increase is primarily due to the reduction in telecommunications services
revenue and increases in personnel and telecommunications related costs. Direct
call provisioning costs decreased to 94% for the three months ended October 31,
1998 compared to 95% for the corresponding prior period. This percentage
decrease is primarily attributable to an increase in higher margin direct call
provisioning revenue. Most of the cost components have remained consistent.

Selling, General and Administrative Expenses. Selling, general and
administrative expenses increased to $2,153,000 for the three months ended
October 31, 1998, from $1,863,000 in the corresponding prior period, and
increased as a percentage of total revenue to 23% from 19% in the corresponding
prior period. Selling, general and administrative expenses associated with the
ICS Division increased by $140,000 to $1,515,000 for the three months ended
October 31, 1998 from $1,376,000 for the corresponding prior period. The
increase was primarily due to an increase of personnel and infrastructure
expenses. Selling, general and administrative expenses for the ICS Division are
expected to be maintained at current levels. Selling, general and administrative
expenses associated with the SpeakEZ Voice Printsm technology were $638,000 for
the three months ended October 31, 1998 as compared to $488,000 for the
corresponding prior period. The increase was due to an increase in legal
expenses and the allowance for bad doubtful accounts. The Company anticipates a
reduction in the administrative costs associated with SpeakEZ due to the
consolidation of corporate facilities. There is also expected to be a reduction
in sales and marketing costs due to the change in the software sales strategy
and a reduction in personnel. However, certain cost may be incurred in
connection with the relocation and other personnel changes. The Company believes
it can implement these reductions without sacrificing potential revenue growth.
There can be no assurance, however, that due to the potential lack of market
acceptance, risk of technological success, or impact of new competition that
revenue will grow at the same rate as that anticipated for selling, general and
administrative expenses.

Research and Development Expenses. Research and development expenses decreased
to $482,000 for the three months ended October 31, 1998, from $582,000 in the
corresponding prior period. The research and development for the Inmate Calling

                                       12
<PAGE>   14

Services division decreased to $149,000 for the three months ended October 31,
1998, from $197,000 in the corresponding prior period. For the three months
ended October 31, 1998, the Company capitalized $271,000 of computer software
development costs associated with the development of a new inmate calling
platform compared to $100,000 for the corresponding prior period. The Company
expects the research and development expense for the ICS Division to increase as
products subject to capitalization become available for general release. The
research and development expense associated with the SpeakEZ Voice Printsm
technology was $333,000 for the three months ended October 31, 1998 as compared
to $385,000 for the corresponding prior period. For the three months ended
October 31, 1998, the Company capitalized $93,000 of computer software
development costs associated with the SpeakEZ Voice Printsm technology compared
to $92,000 for the corresponding prior period. In addition, under a government
contract, the Company is partially reimbursed for expenses on this project. This
reimbursement totaled approximately $106,000 for the three months ended October
31, 1998 and was recognized as a reduction to SpeakEZ Voice Printsm technology
related research and development expenses. Such reimbursements were $190,000 for
the corresponding prior period. The research and development expense associated
with the SpeakEZ Voice Printsm technology is also expected to decrease due to
the consolidation of research facilities and personnel reductions as a result of
the change in software sales strategy.

Depreciation and Amortization Expenses. Depreciation and amortization expenses
decreased to $1,988,000 for the three months ended October 31, 1998, from
$2,148,000 in the corresponding prior period. The decrease is due to a net
reduction in depreciation expense associated with telecommunications equipment
due to certain assets being fully depreciated offset by an increase in
depreciation on office equipment and increased amortization of intangibles. The
depreciation and amortization associated with the SpeakEZ Voice Printsm
technology and the related business acquisition was $229,000 for the three
months ended October 31, 1998 as compared to $263,000 for the corresponding
prior period. The Company anticipates that depreciation expense will increase as
new sites are added, however it will be offset to the extent that equipment
currently in use becomes fully depreciated.

Interest Expense. Interest expense decreased to $236,000 for the three months
ended October 31, 1998, from $270,000 in the corresponding prior period. The
decrease was attributable to a combination of a reduction in the average balance
of indebtedness and a reduction in interest rates.

LIQUIDITY AND CAPITAL RESOURCES

The Company has historically relied upon commercial borrowings, the sale of
equity securities and operating cash flow to fund its operations and capital
needs. Cash provided by financing activities supplied the Company with a
majority of its cash needs for the three months ended October 31, 1998. The net
cash provided by financing activities was $4,313,000 for the three months ended
October 31, 1998 compared to $715,000 for the corresponding prior period. Cash
used in operations was $2,071,000 for the three months ended October 31, 1998 as
compared to cash provided by operations of $1,119,000 for the corresponding
prior period. The change in cash provided by operations was primarily
attributable to changes in net earnings, adjusted for noncash expense items such
as depreciation and amortization, provision for losses on accounts receivable
and the change in the Company's deferred tax provision. Comparably, these net
amounts totaled $1,749,000 for the three months ended October 31, 1998 and
$2,694,000 for the corresponding prior period. The net change in operating
assets and liabilities was the other offsetting difference in the change in cash
provided by operations. The total change for the three months ended October 31,
1998 was made up primarily of increases in accounts receivable of $3,530,000
offset by decreases in accounts payable of $257,000. The total change for the
three months ended October 31, 1997 was made up primarily of increases in
accounts receivable of $1,768,000 and increases in accounts payable of $397,000
and accrued liabilities of $69,000.

Cash used in investing activities was $2,024,000. This included capital
expenditures of $1,068,000 for the three months ended October 31, 1998 as
compared to $1,635,000 in the corresponding prior period. The capital
expenditures for the three months ended October 31, 1998 were mainly for
telecommunications equipment and office equipment. Additional investing
activities of $956,000 for the three months ended October 31, 1998 and $192,000


                                       13
<PAGE>   15

for the corresponding prior period expenditures for investments in preferred
stock and capitalized software development costs. The 1998 total included
$364,000 for software development costs and $592,000 in preferred stock
investment in Cell-Tel Monitoring, Inc., the Company's strategic partner in a
home incarceration and probation administration product, Containsm. The Company
anticipates that capital expenditures for telecommunications equipment will
primarily follow the installation of new systems and will increase as the
current base of systems are upgraded to provide increased functional ability and
to be compliant with FCC regulations regarding rate announcements.

The Company has been funding its operations by using cash provided by operations
and available borrowings under a $20,000,000 line of credit. Management believes
that the credit facility should be sufficient to fund the Company's operations
and anticipated new inmate call processing systems, upgrades of existing
systems, and potential installations for SpeakEZ Voice Printsm for the
foreseeable future. If the borrowing facilities and cash from operations are
insufficient to satisfy the Company's requirements, the Company may be required
to sell additional equity securities or extend its borrowing facilities. There
can be no assurance that such financing will be available or, if available, will
be obtainable on satisfactory terms.

THE YEAR 2000 ISSUE

The Problem. The Year 2000 Issue is the result of computer programs being
written using two digits rather than four to define the applicable year. As a
result, any of the Company's computer programs that have date-sensitive software
may recognize a date using "00" as the year 1900 rather than the year 2000. This
could result in system failures or miscalculations causing disruptions of
operations of the Company and its suppliers and customers.

The Company's State of Readiness. The Company has instituted a Year 2000
Project. As a part of the Company's Year 2000 Project, the Company has completed
its initial evaluation of current computer systems, software, and embedded
technologies. The evaluation revealed that the Company's current proprietary
hardware based inmate calling platform deployed on behalf of the Company's
customers, the internal network hardware and operating system that provides the
Company's Local Area Network ("LAN") and Wide Area Network ("WAN"), voice mail
system, and accounting and business process software are the major resources
that do have Year 2000 compliance issues. These resources will need to be either
replaced or upgraded. Pursuant to the FCC Order 98-7, associated with the
requirement for rate quotes, the Company's inmate calling system must be
upgraded by October 1999. As a result of this upgrade, the inmate calling system
will be Year 2000 compliant. The Company's internal systems and/or programs are
predominantly "off-the-shelf" products with Year 2000 versions now available.
The Company's internal network, e-mail system and accounting and business
process software are scheduled for update utilizing vendor provided upgrades by
June 1999.

As part of the Company's Year 2000 Project, the Company plans to contact its
significant suppliers and large customers to determine the extent to which the
Company is vulnerable to those third parties' failure to remediate their own
Year 2000 Issue. The communications are planned to be completed by January,
1999. However, there can be no guarantee that the systems of other companies on
which the Company's business relies will be timely converted, or that a failure
to convert by another company, or a conversion that is incompatible with the
Company's systems would not have a material adverse effect on the Company and
its operations.

The Costs to Address the Company's Year 2000 Issues. Expenditures for the three
months ended October 31, 1998 for the Year 2000 Project amounted to
approximately $25,000. Management expects that the completion of its Year 2000
Project may result in additional expenditures of approximately $500,000. The
estimated replacement cost of certain network equipment associated with the WAN
portion of the internal network could be an additional $500,000.

The Risks Associated with the Company's Year 2000 Issues. The Company's failure
to resolve Year 2000 Issues on or before December 31, 1999 could result in
system failures or miscalculations causing disruption in operations, including
among other things, a temporary inability to process transactions, send



                                       14

<PAGE>   16

invoices, send and/or receive e-mail and voice mail, or engage in normal
business activities. Additionally, failure of third parties upon whom the
Company's business relies to timely remediate their Year 2000 Issues could
result in disruptions in the Company's supply of network parts and materials,
late, missed, or unapplied payments, temporary disruptions in order processing
and other general problems related to the Company's daily operations. While the
Company believes its Year 2000 Project will adequately address the Company's
internal Year 2000 issues, until the Company receives responses from a
significant number of the Company's suppliers and customers, the overall risks
associated with the Year 2000 Issue remain difficult to accurately describe and
quantify, and there can be no guarantee that the Year 2000 Issue will not have a
material adverse effect on the Company and its operations.

The Company's Contingency Plan. The Company has not, to date, implemented a Year
2000 Contingency Plan. It is the Company's goal to have the major Year 2000
Issues resolved by October, 1999. As part of the Company's Year 2000 Project,
the Company plans to hire additional project management resources. The Company
has not yet been notified by its customers that it will be required to have an
outside consultant to verify and validate the Company's Year 2000 compliance.
Final Year 2000 verification and validation is scheduled to occur April, 1999.
However, the Company would expect to develop and implement a contingency plan by
the end of March, 1999, in the event the Company's Year 2000 Project should fall
behind schedule.



                                       15




<PAGE>   17





                           PART II. OTHER INFORMATION


ITEM 1.  LEGAL PROCEEDINGS

         Not applicable

ITEM 2.  CHANGES IN SECURITIES

         Not applicable.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES

         Not applicable.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         Not applicable.

ITEM 5.  OTHER INFORMATION

         Not applicable.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

         A.    Exhibits

               27       Financial Data Schedule

         B.    No reports on Form 8-K were filed during the three month period 
               ended October 31, 1998.



                                       16
<PAGE>   18

                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                             T-NETIX, Inc.
                                             ---------------------------------
                                             (Registrant)


   
Date:     May 3, 1999                         By: /s/ Alvyn A. Schopp
          -----------                             ----------------------------
    
                                                  Alvyn A. Schopp
                                                  Chief Executive Officer

                                              By: /s/ John Giannaula
                                                  ----------------------------
                                                  John Giannaula
                                                  Vice President Finance
                                                  (Principal Accounting Officer)



                                       17
<PAGE>   19

                                 EXHIBIT INDEX

EXHIBIT
  NO.                     DESCRIPTION
-------                   -----------
  27               Financial Data Schedule