MCMC MTSFB TC T003 :2019 
TECHNICAL  CODE  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PRIVATE AUTOMATIC BRANCH EXCHANGE (PABX) SYSTEM FOR 
CONNECTION TO PUBLIC SWITCHED TELEPHONE NETWORK 
(PSTN) AND INTERNET PROTOCOL (IP) NETWORK  
(SECOND REVISION)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Developed  by  Registered  by 
  
 
 
 
Registered  date:   
 
8 May 2019  
 
© Copyright  2019 
MCMC MTSFB TC T003 :2019 
 Development of technical codes  
 
 
The Communications  and Multimedia  Act 1998  (‘the Act’) provides  for Technical  Standards  Forum  
designated  under  section  184 of the Act or the Malaysian  Communications  and Multimedia  Commission  
(‘the Commission’)  to prepare  a technical  code.  The technical  code  prepared  pursuant  to section  185 
of the Act shall consist  of, at least,  the requirement  for network  interoperability  and the promotion  of 
safety  of network  facilities.  
 
Section  96 of the Act also provides  for the Commission  to determine  a technical  code  in accordance  
with section  55 of the Act if the technical  code  is not developed  under  an applicable  provision  of the Act 
and it is unlikely  to be developed  by the Technical  Standards  Forum  within  a reasonable  time.  
 
In exercise  of the power  conferred  by section  184 of the Act, the Commission  has designated  the 
Malaysian  Technical  Standards  Forum  Bhd (‘MTSFB’)  as a Technical  Standards  Forum, which  is 
obligated,  among  others,  to prepare  the technical  code  under  section  185 of the Act. 
 
A technical  code  prepared  in accordance  with section  185 shall not be effective  until the Commission 
pursuant to section 95 of the Act  registers it . 
 
For further  information  on the technical  code,  please  contact:  
 
Malaysian  Communications  and Multimedia  Commission  (MCMC )  
MCMC Tower 1  
Jalan Impact   
Cyber 6  
63000  Cyberjaya  
Selangor  Darul  Ehsan  
MALAYSIA  
 
Tel: +60 3 8688  8000  
Fax: +60 3 8688  1000  
http://www.skmm.gov.my  
 
 
OR 
 
 
Malaysian  Technical  Standards  Forum  Bhd (MTSFB ) 
Malaysian Communications & Multimedia Commission (MCMC)  
Off Persiaran Multimedia  
Jalan Impact   
Cyber 6  
63000 Cyberjaya  
Selangor Darul Ehsan  
MALAYSIA  
 
 
Tel: +60 3 8320 0300  
Fax: +60 3 8322 0115  
http://www.mtsfb.org.my  
 MCMC MTSFB TC T 003:2019 
i Contents  
 
 
Page  
 
Committee representation  ................................ ................................ ................................ .......................  ii 
Foreword  ................................ ................................ ................................ ................................ ................  iii 
 
1. Scope  ................................ ................................ ................................ ................................ ..............  1 
2. Normative reference  ................................ ................................ ................................ ........................  1 
3. Abbreviations  ................................ ................................ ................................ ................................ ... 1 
4. General requirement  ................................ ................................ ................................ .......................  2 
4.1 Power supply requirements ................................ ................................ ................................ ... 2 
4.2 Power supply cord and mains plug requirements  ................................ ................................ . 2 
4.3 Polarity  ................................ ................................ ................................ ................................ .. 3 
4.4 Interoperability and connectivity requirements ................................ ................................ ...... 3 
4.5 Marking requirements  ................................ ................................ ................................ ...........  3 
4.6 Language  ................................ ................................ ................................ ..............................  3 
4.7 Electromagnetic compatibility and electrical safety requirements  ................................ ........  3 
5. Technical requirements  ................................ ................................ ................................ ...................  4 
5.1 Generic network diagram setup for T erminal Equipment (TE)  ................................ .............  4 
5.2 Extension telephones and exchange lines  ................................ ................................ ............  4 
5.3 Tones and cadences  ................................ ................................ ................................ .............  5 
5.4 Ringing current  ................................ ................................ ................................ ......................  5 
5.5 Numbering scheme  ................................ ................................ ................................ ...............  6 
5.6 Transmission requirements  ................................ ................................ ................................ ... 7 
5.7 Route restrictions  ................................ ................................ ................................ ..................  7 
 
Annex A     Normative references  ................................ ................................ ................................ ............  8 
 
 
 
 
  MCMC MTSFB TC T 003:2019 
ii Committee  representation  
 
 
This technical code was developed by Fixed and Wireless Terminal Working Group  under the Malaysian 
Technical Standards Forum Bhd  (MTSFB) consists of representatives from the following organisations:  
 
Digi Telecommunication Sdn Bhd  
NEC Corporation of Malaysia Sdn Bh d 
Panasonic Malaysia Sdn Bhd  
SIRIM QAS International Sdn Bhd  
Telekom Malaysia Berhad  
TIME dotCom B erhad 
 
 
 
 
 MCMC MTSFB TC T 003:2019 
 
iii Foreword  
 
 
This technical code for Private Automatic Branch Exchange (PABX) System for Connection to Public 
Switched Telephone Network (PSTN) and Internet Protocol (IP) Network (‘this Technical Code ’) 
pursuant to section 185 of the Act 588 .  
 
This Technical Code was developed for the purpose of certifying communications equipment under the 
Communications and Multimedia (Technical Standards) Regulations 2000.  
 
Major modifications in this revision is inclusion of IP technology requirement for IP  PABX.  
 
This Technical Code cancels and replaces  SKMM MTSFB TC T003:2013,  Specification for Private 
Automatic Branch Exchange  (PABX) System for Connection to Public Switched  Telephone Network 
(PSTN) (First Revision) .  
 
This Technical Code shall continue to be valid and effective until reviewed or cancelled.  
 
 
 
 
 
  MCMC MTSFB TC T 003:2019 
iv  
 
 
MCMC MTSFB TC T 003:2019 
1 PRIVATE AUTOMATIC BRANCH EXCHANGE (PABX) SYSTEM FOR 
CONNECTION TO PUBLIC SWITCHED TELEPHONE NETWORK (PSTN) AND 
INTERNET PROTOCOL (IP) NETWORK  
 
 
1. Scope  
 
This Technical Code specifies the technical requirements for legacy Private Automatic Branch 
Exchange (PABX) and Internet Protocol (IP) PABX system for connection to Public Switched Telephone 
Network (PSTN) and IP network respectively . 
 
 
2. Normative reference  
 
The following normative references are indispensable for the application of this Technical Code . For 
dated references, only the edition cited applies. For undated references, the latest edition of the 
normative references (including any amendments) applies .  
 
See Annex A.  
 
3. Abbreviations  
 
For this Technical Code, the following abbreviations and acronyms applies:  
 
AC  Alternating Current  
A-CLIP  Analogue  Calling Line Identity Presentation  
AT Access and Terminal  
ATA Analogue Telephone Adapter  
CAT-5 Category 5  
DHCP  Dynamic Host Configuration Protocol  
DTMF  Dual Tone Multi -Frequency  
ETH Ethernet  
FXO Foreign Exchange Office  
FXS Foreign Exchange Subscriber  
GSM  Global System for Mobile Communication  
IDD International Direct Dial  
IPv6 Internet Protocol version 6  
LAN Local Area Network  
NU Number Unobtainable  
POS  Point of Sale  
PVC Polyvinyl Chloride  
RFC Request for Comment  
SP Service Provider  
SIP Session Initiation Protocol  
SRTP  Secure Real – Time Protocol  
TE  Terminal Equipment  
TCP Transmission Control Protocol  
TNV Telecommunication Network Voltage  MCMC MTSFB TC T 003:2019 
2 UDP  User Datagram Protocol  
Vrms Voltage root mean square  
VoIP  Voice over Internet Protocol  
 
 
4. General requirement  
 
4.1 Power supply requirements  
 
Requirements for power supply are as  follows:  
 
a) For Alternating Current (AC) powered Terminal Equipment (TE), the operating voltage shall be 
rated/marked at 230  V or 240  V in line with the country's nominal voltage and frequency in 
accordance to MS IEC 60038. If the product is rated with multiple or a range of voltages, voltage 
range between 230  V (+ 10 %, - 6 %) shall be included. Testing shall be conducted based on 230  V 
(+ 10 %, - 6 %) or 240  V and other relevant voltages, if the product is marked with multiple or a 
range of voltages.  
 
b) Product shall be rated/marked at 50  Hz and testing shall be conducted at 50  Hz. If the product is 
marked at 50/60  Hz or 50  Hz - 60 Hz then testing shall be conducted either at 50  Hz or 60  Hz, 
whichever is more unfavourable . 
 
c) The design of the TE shall be s uch that all essential items of equipment of the TE shall be powered 
from batteries on float charge such that the performance of the system shall not  deteriorate in any 
way on failure of the electricity mains supply. Non -essential test equipment and other auxiliary 
devices may directly work off the electricity mains supply.  
 
d) The system shall operate on 48 V (nominal) with positive earthing, and shall function satisfactorily 
within a voltage range of 42 V to 54 V for not less than 80  % of the calls and shall  function 
satisfactorily within a voltage range of 44 V - 52 V for 100  % of the calls.  
 
e) Where external power supply is used, e.g. AC adaptor or battery, it shall not affect the capability of 
the TE to meet this specification.  
 
f) Adaptor shall be pre -approved  by the relevant regulatory body before it can be used with the TE.  
 
4.2 Power supply cord and mains plug requirements  
 
TE shall be fitted with a suitable and appropriate approved power supply cord and mains plug. Both are 
regulated products and shall be p re-approved by the relevant regulatory body before it can be used 
with the TE.  
 
4.2.1  Power supply cord requirements  
 
The power supply cord shall be certified according to:  
 
a) MS 2112 -5 or BS EN 50525 -2-11 or IEC 60227 -5 (Polyvinyl Chloride (PVC) insulated  - flexible 
cables/cords);  or 
 
b) MS 140 or MS 2127 -4 or IEC 60245 -1 & IEC 60245 -4 (Rubber insulated  flexible cables/cords) . 
 
 
 
 
 
 MCMC MTSFB TC T 003:2019 
 
3 4.2.2  Mains plug requirements  
 
The main s plug shall be certified according to:  
 
a) MS 589: Part 1 or BS 1363: Part 1  (13 A fused plugs ); or 
 
b) MS 1577 or BS 546  (15 A plugs ); or 
 
c) MS 1578 or BS EN 50075  (2.5 A, 250  V, flat non -rewirable two -pole plugs ). 
 
4.3 Polarity  
 
The performance of the TE shall be independent of the PSTN line polarity i.e. the TE shall conform to 
both polarities of the line feeding ( clause A.3  of ETSI ES 203021 -1).  
 
4.4 Interoperability and connectivity requirements  
 
TE shall comply with the minimum requirement that is specified by the Service Provider (SP).  
 
4.4.1  Interoperability  
 
TE shall be able to exchange and/or use information between two or more systems or components.  
 
4.4.2  Connectivity  
 
TE shall be able to link with other programs and devices to allow interoperability.  
 
4.5 Marking requirements  
 
Marking requirements are as follows:  
 
a) TE shall be marked with the following information:  
 
i) supplier/manufacturer’s name or identification mark;  
 
ii) supplier/manufacturer’s model or type reference; and  
 
iii) other markings as required by the relevant standards.  
 
b) The markings shall be legible, indelible and readily visible .  
 
4.6 Language  
 
All markings, software and related doc uments shall be in Bahasa Malaysia  or English language.  
 
4.7 Electromagnetic compatibility and electrical safety requirements  
 
Requirements for electromagnetic  compatibility and electrical safety  are as follows:  
 
a) TE shall comply with the limits for conducted disturbance at the mains terminals and 
telecommunication ports, and the limits for radiated disturbance defined in the IEC CISPR 32.  
 
b) TE shall comply with the MS IEC 60950 -1 safety standard. The requirements in MS IEC 60950 -1 
that are applicable to the TE e.g. class of equipment, type of Telecommunication Network Voltage 
(TNV) circuit and types of components shall be identified and compl ied with.  
  MCMC MTSFB TC T 003:2019 
4 5. Technical requirements  
 
5.1 Generic network diagram setup for T erminal Equipment (TE)  
 
The generic network diagram of TE is as illustrated in Figure 1.  
 
 
 
Figure 1. Terminal Equipment (TE) n etwork diagram  
 
5.2 Extension telephones and exchange lines  
 
Requirement for extension telephones and exchange lines are as follows:  
 
a) The PABX supplied shall be able to accept the use of:  
 
i) Dual Tone Multi -Frequency (DTMF) push -button telephones .  
 
ii) Rotary dial telephones ( decadic pulse).  
 
b) TE that connected to PSTN shall be designed to meet the following requirements:  
 
i) In addition, where PABX system is connected to PSTN, it shall comply with the requirements 
for connection to PSTN  in accordance to  SKMM MTSFB TC T001.  
 
ii) In addition, where PABX system supported Analogue Calling Line Identity Presentation (A-
CLIP ), it shall comply with A -CLIP requirement  in accordance to  SKMM MTSFB TC T002 . 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
c) TE which the target stations are analogue lines, shall be designed to meet the requirements  5.3 
and 5.4 (refer Table 1 ). 
 
d) The input/output of IP PABX, shall be complied with Voice over I nternet Protocol ( VoIP ) 
requirements as follow s: 
    
MCMC MTSFB TC T 003:2019 
 
5 i) Signalling Protocol: Session Initiation Protocol  (SIP) RFC 3261  with an option ITU-T H.323 . 
 
ii) Transport Protocol: User Datagram Protocol (UDP ) with an  option Transmission Control 
Protocol (TCP) or Secure Real-Time Protocol (SRTP ). 
 
iii) Codec: ITU-T G.711  (a-law and µ -law) with an option ITU-T G.726  or ITU-T G.729A . 
 
iv) DTMF: Inband, RFC  2833 . 
 
v) Fax protocol: ITU-T G.711 and/or ITU-T T.38. 
 
vi) IP assignment: Dynamic Host Configuration Protocol (DHCP ) and/or Static IP . 
 
vii) Addressing: RFC  6157 (applicable for Internet Protocol version 6 ( IPv6)). 
 
5.3 Tones and cadences  
 
Requirement for tone and cadences are as follows:  
 
a) The frequency and cadence for the tones shall comply with the specification in Table 1. The 
allowable frequency deviation is ± 5  % of nominal value.  
 
b) The ring back tone shall be returned to the calling party whenever an extension line in the system 
is being rung, irrespective of whether the call is internal or external.  
 
c) TE with capacity above 100 extens ions shall be incorporated with  Number Unobtainable  (NU) tone 
facilities and shall comply with Table 1.  
 
5.4 Ringing current   
 
Requirement for ringing current are as follows:  
 
a) Cadence of ringing current shall comply with the specification in Table 1.  
 
b) Ringing current generator shall have open circuit voltage of not less than 75 V rms and not greater 
than 85 V rms and a design nominal frequency within the range of 16 Hz to 25 Hz. The total harmonic 
distortion shall not exceed 30 %.  
 
c) Terminal voltage on full load shall be at least 60 V rms. 
 
Table 1. Ringing signal and service tone 
 
No. Type of tone  Cadence  (second ) Frequency 
(Hz) Level  
(dBm) 
1 Ringing current  0.4 ON 0.2 OFF  
0.4 ON 2.0 OFF  16-25 75 V rms 
2 Dial tone Continuous  425 - 15 to - 9 
3 Ring tone  Internal call  1.0 ON  
3.0 to 5.0 OFF  425 - 12 
External call  0.4 ON, 0.2 OFF  
0.4 ON, 2.0 OFF  425 - 15 to - 9 
 
 
Table 1. Ringing signal and service tone (continue)  MCMC MTSFB TC T 003:2019 
6  
No. Type of tone  Cadence (second)  Frequency 
(Hz) Level (dBm)  
4 Ring back 
tone Internal call  0.4 ON, 0.2 OFF  
0.4 ON, 2.0 OFF  425 - 12 
External call  0.4 ON, 0.2 OFF  
0.4 ON, 2.0 OFF  425 - 15 to - 9 
5 Busy tone (Engage tone)  0.5 ON, 0.5 OFF  425 - 15 to - 9 
6 Congestion tone  Either,  
i) 0.5 ON, 0.5 OFF  
or 
ii) 0.25 ON, 0.25 OFF  425 - 15 to - 9 
7 Intrusion warning tone  0.2 ON, 0.2 OFF  
0.2 ON, 5.0 OFF  425 -15 to - 9 
8 NU tone  2.5 ON, 0.5 OFF  425 -15 to - 9 
 
5.5 Numbering scheme  
 
The generic numbering scheme for TE should be as per Table 2 . 
 
Table 2 . Numbering scheme and description  
 
Numbering 
scheme  Description  
2xxx 
3xxx 
4xxx 
5xxx 
6xxx Extension n umbers  
7xxx Extension n umber/ abbreviated dialling  
8x Tie lines1 
9 Access to exchange lines  
0 PABX o perator  
1xx Services  
 
5.5.1 Extension lines and T erminal Equipment (TE)  capacity  
 
Extension Line and TE capacity  are as follows:  
 
a) TE with up to 50 extension lines, two digits numbering is acceptable.  
 
b) TE with more than 50 extension lines and up to 500 extension lines, three digits numbering shall 
be use d. 
 
                                                      
1 Tie lines is a leased/dedicated circuit linking two PABXs located in different premises  MCMC MTSFB TC T 003:2019 
 
7 c) TE with more than 500 extension lines, four digits and above shall be used, depending on the 
capacity of the system.  
 
5.5.2  Public exchange lines  
 
Access digit for the public exchange lines shall be ‘9’.  
 
5.5.3  Operator  
 
Access digit for the operator shall be ‘0’.  
 
5.5.4 Tie-lines  
 
The first digit of tie -lines access code shall be ‘8’.  
 
5.5.5  Services  
 
The first digit of services access code shall be ‘1’ . 
 
5.6 Transmission requirements  
 
Requirements for extension line circuit are as follows:  
 
a) The TE with Foreign Exchange Subscriber (FXS) interface shall function satisfactorily with an 
extension line loop resistance of up to 1,500 Ω with a leakage resistance of down to 20,000 Ω. 
 
b) The TE with Local Area Network (LAN) interface shall function satisfactorily with maximum length 
of 100 m of minimum CAT -5 ethernet cable.  
 
5.7 Route restrictions  
 
Requirement for route restrictions are as follows:  
 
a) The route restriction equipment shall be of the type that counts the total number of digits dialled as 
well as analyse the number of pulses of the first two or three digits so as to render the route 
restriction facility as fool -proof as possible.  
 
b) Alternatively, the digit analysis in the route restriction equipment shall commenc e analysis of the 
first digit dialled only after the route restriction equipment detects the public exchange dial tone.  
 
c) The route restriction equipment shall reactivate the digit analysis function whenever the public 
exchange dial tone is detected.  
 
d) First two digits “00” (International Direct Dial (IDD) ) and first three digits “101”, “103” and “108” are 
barred . 
  MCMC MTSFB TC T 003:2019 
8 Annex A  
(Normative)  
 
Normative references  
 
MS 140 , Specification for insulated flexible cords and cables  
 
MS 589: Part 1 , Specification for 13 A plugs, socket outlets, adaptors and connection units Part 1: 
Specification for rewireable and non -rewirable 13 A fused plugs  
 
MS 1577 , Specification for 15A plugs and socket -oulets for domestic and similar purposes  
  
MS 1578 , Specifi cation for flat non -rewirable two -pole plugs, 2.5 A, 250 V, with cord, for the connection 
of class II -Equipment for household and similar purposes  
 
MS IEC 60038 , IEC standard voltages  
 
MS IEC 60950 -1, Information technology equipment - Safety - Part 1: Gen eral requirements  
 
SKMM MTFSB TC T001 , Specification for terminal equipment connecting to the Public Switched 
Telephone Network (PSTN)  
 
SKMM MTFSB TC T002 , Specification for Analogue calling line Identity presentation (A -CLIP) facility 
for connection to Pu blic Switched Telephone Network (PSTN)  
 
ITU-T G.711, Pulse Code Modulation (PCM) of voice frequencies   
 
ITU-T G.726 , 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)  
 
ITU-T G.729A,  Coding of Speech  at 8 kbit/s using Conjugate -Structure Algebraic -Code -Excited Linear 
Prediction  (CS-ACELP)   
 
ITU-T H.323, Packet -based multimedia communications systems   
 
ITU-T T.38, Procedures for real -time Group 3 facsimile communication over IP networks  
 
IEC CISPR 32 , Electromagnetic co mpatibility of multimedia equipment - Emission requirements  
 
IEC 60227 -5, Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V - Part 
5: Flexible cables (cords)  
 
IEC 60245 -4, Rubber insulated cables - Rated voltages up to and  including 450/750 V - Part 4: Cords 
and flexible cables  
 
ETSI ES 203 021 , Access and Terminals (AT); Harmonized basic attachment requirements for 
Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical 
contents of TBR 021, EN 301 437, TBR 015, TBR 017  
 
BS 1363: Part 1 , 13 A plugs, socket -outlets, adaptors and connection units - Part 1: Specification for 
rewirable and non -rewirable 13 A fused plugs  
 
BS 546 , Specification for AC power plugs and sockets  
 
BS EN 50075 , Specification for flat non -wirable two -pole plugs 2.5 A 250 V, with cord, for the connection 
of class II -equipment for household and similar purposes  
 MCMC MTSFB TC T 003:2019 
 
9 BS 6500 , Electric cables Flexible cords rated up to 300/500 V, for use with appliances and equipment 
intended for domestic, office and similar environments  
 
RFC 2833, RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals   
 
RFC 3261, SIP: Session Initiation Protocol  
 
RFC 61 57, IPv6 Transition in the Session Initiation Protocol (SIP)MCMC MTSFB TC T 003:2019 
 Acknowledgement s 
 
 
Members of the Fixed Terminal Sub Working Group  
 
Mr Ahmad Faizan Pardi (Chairman)  SIRIM QAS International Sdn Bhd  
Mr Mohd Syaukiazahar Mohd Razali  (Vice Chairman)  Telekom Malaysia Berhad  
Mr Ahmad Taufik Nik Nor Azlan (Secretar iat)  Malaysian Technical Standards Forum Bhd  
Mr K.N Hilayarajah  Digi Telecommunications Sdn Bhd  
Mr Lee Cheng Yong  NEC Corporation of Malay sia Sdn Bhd  
Mr Pang Chieng Yong  Panasonic Malaysia Sdn Bhd  
Ms Hafizah Zainal Abiddin  SIRIM QAS International Sdn Bhd  
Mr Md Azmi Karnain/  Telekom Malaysia Berhad  
Ms Rose Hayati Abdul Halim/   
Mr Arief Khalid Supian/   
Mr Mior Mohd Hadzlan Hamid   
Mr Samsuri Abu Samah/  TIME dotcom Berhad  
Mr Md Zakir Bajuri /  
Mr Mohd Jali Senin