"Summons have not been served to my client at his proper residential address and he is seeking a month's exemption as he is at present abroad," senior advocate Siddharth Luthra, appearing for Vikash Saraf, Essar group Director (Strategy and Planning), told Special CBI Judge O P Saini.

The plea the summons have not been "duly" served was cited by Ruias and Khaitans too.

The Special CBI Judge had earlier on December 21, had issued summons to Essar Group promoters Anshuman and Ravi Ruia, Loop Telecom promoters I P Khaitan and Kiran Khaitan, Vikash Saraf and three firms after taking cognisance of the CBI charge sheet arising out of the probe in the 2G scam.

However, the representatives of accused firms, Loop Telecom Pvt Ltd, Loop Mobile India Ltd and Essar Teleholdings today appeared in pursuance to the summons.

Special Public Prosecutor U U Lalit questioned the non-appearance of some of the accused saying that the defence counsel were "indirectly asking for the stay of proceedings" which they failed to get from the Delhi High Court.

The defence lawyers said that Ruias and Khaitans are at present in Dubai and the CBI officials pasted copies of the summons at their Delhi and Mumbai addresses.

The agency did not execute the service of summons at proper addresses, they said.

Seeking the court's intervention, the defence lawyers said that the matter be deferred as the issue relating to the jurisdiction of the special CBI Judge was pending adjudication before the Delhi High Court.

Earlier, the High Court had asked the Essar Teleholdings and Loop Telecom and the CBI to approach the Supreme Court to get clarifications on the directions which restrained other courts from entertaining pleas related to the 2G case.

The apex court had also ordered constitution of a special court to deal with the matters arising out of the probe in the 2G case. Two accused firms have sought setting aside of the notification by which the special court was formed.

"As per the High Court order, both parties (CBI and the accused) have to move to the Supreme Court on the issue of jurisdiction of this (special) court. The court may adjourn the matter as this matter is going to the very root of jurisdiction and so that we can go to the Supreme Court and deal with the matter," the counsel for Loop Telecom said.

"They (defence counsel) are indirectly asking for the same relief (staying of proceedings) which they have failed to get from the Delhi High Court," Lalit responded.

The Supreme Court had amply made it clear that none other than the special court would hear the matter related to the 2G case, the special prosecutor said.