Hi, We would like to know what would happen in the following cases involving CFNR:
(a) SIP User A calls a ISDN User B connected to a Class 5 softswitch. User B has CFNR to a SIP user C. The scenario is illustrated below. Upon reception of message 10 (18x) with SDP_answer2, we assume that the softswitch shall send the 18x (message 11) with a different "To" tag, as compared to what was sent in message 5. Otherwise, we don't see a way of transporting the "new" SDP answer before the completion of INVITE transaction in the case of unreliable 18x responses. Is our understanding correct? Note: In the case of reliable 18x responses, message 10 can be interworked by the softswitch to an UPDATE message. [cid:[email protected]] (b) SIP User A calls SIP User B. SIP endpoint B has CFNR active to another SIP User C. The scenario is illustrated below. Our understanding is, Proxy B sends the 180 Ringing (message 12) with a different "To" tag, as compared to the one in message 5, if reliable 18x response is not supported. Is this correct? [cid:[email protected]] Regards, Swami. The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com
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