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Dynamic STD/ISD Facility


After registering the secret code, note it down somewhere. Repetitive attempts using a wrong code may permanently jam the STD/ISD and disable the dynamic control facility. In such a case re-setting is done by an application at the Customer Centre. After initialization, re-register your secret code afresh as per the procedure for initial registration. Normally keep your STD\ISD barred. Open it when you need it. Again bar it after use.


Facility is provided free of charge.

Where to Apply

To avail the facility please apply to Divisional Customer Service Center of your Area.

Whom to Contact

In case of difficulty, Please contact DE(I/D) in charge of the exchange.

Exchanges and their Codes

Digital Electronic Exchanges (5ESS) :
325, 431, 432, 581, 612, 613, 614, 615, 616, 617, 618, 619, 625, 628, 629, 641, 649, 689, 701, 702, 704, 705, 726, 745, 746, 786, 787

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