Hi *, Whether below mentioned scenarios correct from Offer/Answer model point of view ?
1. INVITE/18x (Reliable) for Offer/Answer1. 200 OK (INVITE)/ACK for Offer/Answer2. 2. INVITE/18x (Reliable) for Offer/Answer1. PRACK/200 OK (PRACK) for Offer/Answer2. 200 OK (INVITE)/ACK for Offer/Answer3. 3. INVITE/18x (Reliable) for Offer/Answer1. UDPATE/200 OK (UPDATE) for Offer/Answer2. 200 OK (INVITE)/ACK for Offer/Answer3. 4. INVITE/18x (Reliable) for Offer/Answer1. PRACK/200 OK (PRACK) for Offer/Answer2. UDPATE/200 OK (UPDATE) for Offer/Answer3. 200 OK (INVITE)/ACK for Offer/Answer4. My doubt is mainly for the case, where Offer is received in 200 OK (of INVITE) (later Answer in ACK), as already the offer/answer exchange has happened for that SIP transaction via INVITE/18x(reliable). I have read somewhere, that there should be only one offer/answer exchange for a SIP transaction. Please clarify. Thanks, kumar Please do not print this email unless it is absolutely necessary. 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 _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
