New Delhi, Jan 04 (Agencies): In a move that could see GenNext mobile services including video calls being available to customers, the government on Tuesday said telecom operators can roll out 3G telephony while working on the modalities to provide monitoring facilities to the security agencies.

The Union Home Minister P Chidambaram said the Department of Telecom and his ministry were working together in putting in place some rules and norms for intercepting or  monitoring of 3G transactions in the interest of national security.

"We are putting in place certain mechanisms to monitor and intercept 3G services where it become necessary on the grounds of national security.

"The idea is not to interrupt or delay the 3G services. The idea is to allow 3G services to go forward even while monitoring mechanisms are put in place," Chidambaram said.

"So no one need to fear that the 3G services will be interrupted or delayed," he added.

Earlier, DoT had issued notices to a few telecom operators asking them to stop the GenNext mobile services -- 3G -- which includes video calling facility -- asking them to put on hold the new services till they adhered to security norms for its legal interception.

The DoT had sent a letter to both TTSL and RCom asking them not to launch 3G services on commercial basis till they demonstrate lawful interception facilities.

3G mobile services mainly include voice call, video calls and data services. In the data services, operators are claiming to offer high-speed internet service and required to offer monitoring facility.

According to an exhaustive note sent by the Union Home Ministry to the DoT, a  demonstration was organised by Reliance, Tata Teleservices and Bharti during which the law enforcement agencies pointed out that online delivery of video call intercepts "in real time" could not be carried out by any of the telecom operators.

During the demonstration carried out by these telecom service providers, it came to light that long duration video calls, both incoming and outgoing, could not be intercepted, the sources had said.

"Outgoing and incoming video calls after eight minutes could not be intercepted and displayed," they said.

The service providers are pushing the contents of the calls in raw format to the server of the agencies, which require use of decoders to view and listen to them, the sources said.

The security agencies pointed out that if interception is done on a 3G handset, only noise is heard as indication of video call.

"A conference call is not distinctly labelled. On the other hand, it is displayed as a two different outgoing calls," the note said, adding the service providers should be directed to make provisions for proper tagging.