Hi It's actually an indication to the peer about the extensions supported by itself. So the Peer will act accordingly.
For eg. UAC sends INVITE with Supported: 100rel, It means Reliable provisional response is supportedby the UAC, So now the Peer(UAS), if it supports 100rel will send 180 reliably. So it is an indication to the Peer and the Peer will take action accordingly. Extensions used in Supported header can be 100rel, timer Regards, Sunil "This email message and any attachments are confidential information of Starent Networks, Corp. The information transmitted may not be used to create or change any contractual obligations of Starent Networks, Corp. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this e-mail and its attachments by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify the sender immediately -- by replying to this message or by sending an email to [EMAIL PROTECTED] -- and destroy all copies of this message and any attachments without reading or disclosing their contents. Thank you." _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
