Tdsat has asked Trai to file its reply within two weeks.
Tdsat has also asked COAI to file a report within two weeks stating as to what was leading to poor call quality in their network.
The next date of hearing on the issue is slated for April 27.
Meanwhile, in a statement on Tuesday, Trai stated that since the matter is subjudice it has decided not to take further action on the show cause notices till the matter is decided by Tdsat.
Trai on March 6 issued show cause notices to Bharti Tele-Ventures, Tata Teleservices Ltd, Reliance Infocomm Ltd as well as Reliance Telecom, BPL Mobile, and Spice Communication since congestion at their point of interconnect was more than the benchmark 5% during the quarter ending December 2005.