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Hello, The question is: where is the "pending" request in the presented scenario with the BYE sent in a early dialogue. The same RFC also states: "The notion of "hanging up" is not well defined within SIP. It is specific to a particular, albeit common, user interface. Typically, when the user hangs up, it indicates a desire to terminate the attempt to establish a session, and to terminate any sessions already created. For the caller's UA, this would imply a CANCEL request if the initial INVITE has not generated a final response, and a BYE to all confirmed dialogs after a final response." So I wonder under what circumstances a BYE would be sent instead of a CANCEL when the INVITE has not resulted in a session yet. Kind regards, Jan On 7/10/2013 13:30, Preksha Gupta
wrote:
Hi Pravin It is recommended for UAS to send 487 for pending requests in such scenarios. Refer Section 15.1.2 of RFC 3261:" The UAS MUST still respond to any pending requests received for that dialog. It is RECOMMENDED that a 487 (Request Terminated) response be generated to those pending requests." Regards Preksha <http://tools.ietf.org/html/rfc3261#section-15.1.2> On Mon, Oct 7, 2013 at 4:49 PM, Pravin Kumar <pravink...@gmail.com> wrote:According to RFC 3261: Early Dialog can be terminate sending by BYE or CANCEL for UAC side. In case of CANCEL we should send 487 for INVITE UAC UAS ---------INVITE---------------------> < ---------180---------------------- ----------CANCEL----------- > < ---------200 CANCEL------- < -----------487 --------------- ------------ACK 487-----------> But in the of BYE: UAC UAS -------INVITE-----------------> < ---------180----------------- ----------BYE ---------------- > < ---------200 BYE ----------- <--(what should be send)----- (503 or 487) ------------ACK -------------> So in the case of sending BYE by UAC , UAS should send 503 or 487 for INVITE. Thanks, Pravin _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors |
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