Please read this RFC tools.ietf.org/html/rfc4916 ________________________________
From: [email protected] on behalf of Volkan Hatem Sent: Fri 5/28/2010 2:02 AM To: [email protected] Subject: [Sip-implementors] Need clarification on RFC4916 Hi, Unfortunately the RFC is not clear how 200OK & ACK are affected after an early-dialog UPDATE. Please see the following call flow where in the original INVITE From is Alice and To is Bob. After receiving 18x, from-change UPDATE is sent with From set to Carol. I'm confident that ACK must convey the same From/To headers as the original INVITE. However I'm not sure about 200 OK to the INVITE request after receiving UPDATE. What do you think? Alice Bob | | | | |(1) INVITE | |(From:Alice, To:Bob) | |--------------------------------->| | | |(2) 18X | |(From:Alice, To:Bob) | |<---------------------------------| | | |(3) UPDATE | |(From:Carol, To:Bob) | |--------------------------------->| | | |(4) 200 OK (UPDATE) | |(From:Carol, To:Bob) | |<---------------------------------| | | |(5) 200 OK (INVITE) | |(, From:?, To:Bob) | |<---------------------------------| | | |(6) ACK | |(From:Alice, To:Bob) | |--------------------------------->| | | | | | | | | Alice Bob _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors 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
