**Exhibit 4.27.1**

**ADDITIONALAGREEMENT No. 1аTo Contract on Network Connection between OAO Rostelecom and OAOUralsvyazinformdated January 01, 2006**
|          Moscow |   | March 11, 2006 |
|-----------------------------------------------|--------|---------------------|

 

Rostelecom, Open Joint-Stock Company for Long-Distance and InternationalTelecommunications, hereinafter, “Rostelecom”, represented by OAO RostelecomGeneral Director Dmitry Yevgenievich Yerokhin, authorized to act by Charter, onthe one part, and Uralsvyazinform, an Open Joint-Stock Company, hereinafterreferred to as the “Operator”, represented by General Director AnatolyYakovlevich Ufimkin, authorized to act by Charter, on the other parthereinafter collectively referred to as the “Parties”, and severally, as “Party”,have entered into this Additional Agreement (hereinafter, “the Agreement”) onthe incorporation of the below-listed amendments in the Contract on NetworkConnection (hereinafter, “the Contract”), as follows:

1.                   In clause 1.6. of the Contract - to excludethe last paragraph.

2.                   Clause 1.7. of the Contract shall be amendedas follows:

«1.7. “Associated Operator” shall mean atelecommunications operator who meets all of the following criteria:

а)the telecommunication network of such an operator is interconnected into thenetwork of the Operator on the local and/or zonal level;

b)such an operator on the basis of a correspondent contract concluded betweenthis operator and Rostelecom, or between this operator and The Operator onbehalf of Rostelecom performs billing of its Users for Long-Distance andInternational Telecommunication services rendered by Rostelecom or the Operatoron behalf of Rostelecom performs billing with the Users of such an operator forLong-Distance and International Telecommunication Services rendered byRostelecom».

3.                   In clause 1.13.of the Contract, the words “Operator’s Users” shall be substituted by the word “Users”.

4.                   Paragraph 3.3shall be added by a paragraph as follows:

« 3.3.11. “To inform Rostelecom on the numberingcapacity of the Associated Operators and its changes. The Operator no laterthan the last day of the Accounting Period submits to Rostelecom the detailedinformation on numbering capacity of the Associated Operators in accordance toAppendix 5”.

5.                   Clause 6.1. ofthe Contract shall be amended as follows:

« 6.1. Terms of paymentfor Traffic Admission Services:

6.1.1. Rostelecom shall pay for Traffic admissionservices in accordance with tariffs specified in Appendix No. 1 attachedherein. The cost of Traffic admission Services for the Accounting period iscalculated on the basis of the data on the natural volumes of the renderedTraffic admission Services during the Accounting period.

6.1.2. Rendering Traffic Admission Services billing iscalculated on a minutely basis commencing from the 1st second of the connection and the rounding upof the time of the connection up to the whole minute;

6.1.3. To calculate the time of the connectionsperformed, besides the Traffic Admission Services through codes 803 Х1Х2Х3, a protection Interval is applied(non-billed limit) of 5 seconds;

6.1.4. Time of the connections performed through codesis calculated from the 1st second of the connection».

6.               Clause 12.1. of theContract shall be amended as follows:

The Agreement is validfor the period of one year from the moment of its coming into effect. Ifneither Party announces termination of this Agreement thirty (30) calendar daysbefore its stated expiration, this Agreement shall be automatically extendedfor each subsequent year. The number of periods for which the effect hereof canbe prolonged is not limited.

7.               The followingParagraph shall be included in Appendix 1:

1.3. Cost of the servicesof updating subscriber information in the database, for one line of update:
| **No.** | ** ** | **Description of the service**                                    | ** ** | **Rubles, excluding VAT** |
|---------|------------|-------------------------------------------------------------------|------------|---------------------------|
| 1.      |       | Update of the Operator’s Subscribers information             |       | 1.00                      |
| 2.      |       | Update of the Associated Operator’s Subscribers  information |       | 2.00                      |

 

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8.              Appendix No. 7 of the Contract****shall be amended as follows:

**Appendix7 to Contract on NetworkConnection dated January 01, 2006**

**SETTLEMENT PROCEDURE FOR TRAFFIC ADMISSION SERVICES**

Whereas the Parties  confirm and accept that amounts payable andterms of payment for Connection services rendered by  Rostelecom to the Operator and for Trafficadmission services rendered by the Operator to Rostelecom shall be determinedin accordance with fulfillment by the Parties obligations specified inAgreement No.          dated                     (hereinafter referred to as “Assistance Agreement”) concluded between them nowtherefore the Parties agree to establish the following procedures for paymentson this Contract:

1.                   Rostelecom shallpay to the Operator for Traffic admission services rendered to Rostelecom bythe Operator remuneration in accordance with terms and amounts specifiedhereinafter. Total amount of financial obligations payable by Rostelecom forservices rendered by the Operator to Rostelecom in relevant billing period shallbe determined in accordance with the Services Report for the Accounting period.

2.                   Within theterm  before the 25th day of the Billingperiod Rostelecom is obliged to transfer to the Operator the sum in the amount Х,equal to the summary cost of the traffic admission Services rendered by theOperator during all periods preceding the Billing period, unpaid for byRostelecom, the cost of which has been calculated in accordance with Appendix 1to the Agreement. At that, the maximal amount of Х, due to payment inevery Billing period equals Z, the value of which is calculated by thefollowing formula:

**Z = M — Y**, where

**M and Y —**have the valuecalculated for them in par. 2.2. of Appendix 7 of the Assistance agreement for thecorresponding Billing period.

The calculated sum **Х** is reckoned by the Operator on account of paymentfor the traffic admission Services rendered to Rostelecom under this Agreement,during all its validity periods in the part where these services are not paidfor at the moment of payment calculation. The Parties agree that the paymentsare in the first place accounted against the payment for traffic admissionServices rendered during earlier periods.

3.                   Rostelecomtransfers to the Operator payments in accordance with par. 2 hereof until thetotal amount of payments transferred by Rostelecom hereunder equals the totalcost of the traffic admission Services rendered to Rostelecom by the Operatorhereunder.

4.                   The Operatorshall issue invoices for payments to Rostelecom in accordance with paragraph 2of this Appendix for amounts determined in accordance with terms specified inaforesaid paragraph by 20th day of the month in which relevant payment is to beeffected.

5.                   In case by the25th day of the Billing period the total cost of the traffic admission Servicesrendered to Rostelecom by the Operator in accordance with the Act of servicesrendered during the corresponding Accounting period, exceeds the amount of theAccrued income for the telecommunications Services rendered by Rostelecom tothe Users during the corresponding Accounting period, with the deduction ofPotential income of the Operator from the services connected with them, rendered to Rostelecom by the Operator inaccordance with Assistance agreement, the difference between the indicatedamounts must be paid by Rostelecom to the Operator before the 25th day of theBilling period in addition to the amount X due to payment in accordance withpar. 2 hereof. At that, the Potential income is calculated as the sum ofAccrued income multiplied by the service payment rate and the remuneration forthe performance of the actions specified in Appendix 2 to the Assistanceagreement.

6.                   In order toterminate (partially terminate) the obligations specified in this Appendix andmutual obligations of the Parties arising from Assistance Agreement the Partiesshall perform monthly offset counterclaims by execution of Offset Acts in duedates set for fulfillment of such obligations by the Parties in accordance withterms specified herein and in Assistance Agreement.

7.                   This Agreement isan inseparable part of the Contract.

8.                   All terms used inthis Agreement have a meaning, fixed for them in the Contract.

9.                   All the rest, notindicated in this Agreement, is subject to the provisions of the Contract.

10.             The agreement isissued in the Russian language in two copies, one for  each Party.

11.             This Agreementshall come into force from the date hereof. The Parties hereby establish thatterms and conditions of the Agreement entered into thereby shall apply to theirrelations arisen from the date of the Contract on Telecommunications NetworkConnection dated January 01, 2006.

12.             Details andSignatures of the Parties

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| **OAO Rostelecom:**            |   | **OAO Uralsvyazinform:**            |
|--------------------------------|--------|-------------------------------------|
|                           |   |                                |
| Legal address: 127091, Moscow, |   | Legal address: 620014               |
| Delegatskaya st., 5            |   | Yekaterinburg, Moskovskaya  st., 11 |
|                           |   |                                |
| **General Director**           |   | General Director                    |
| OAO Rostelecom                 |   | OAO Uralsvyazinform                 |
|                           |   |                                |
| /signed/ D.Ye. Yerokhin        |   | /signed/ A. Ya. Ufimkin             |
| Dated 11.03.2006               |   | Dated 11.03.2006                    |
| Seal here                      |   | Seal here                           |

 

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