2) IN-DIALOG-1 = INVITE, IN-DIALOG-2 = INVITE >> >> What should reply bob for the second INVITE?
[Query] regarding UAS Sending 491 response in the above mentioned scenario. 21.4.27 491 Request Pending The request was received by a UAS that had a pending request within the same dialog. Section 14.2 describes how such "glare" situations are resolved. As per rfc 3261 section 21.4.27 does it mean that 491 response is sent only for glare situation or it can be sent in a situation where UAS had pending request within the same dialog. Thanks & regards Sharath -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Paul Kyzivat Sent: Tuesday, April 10, 2012 9:10 PM To: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] Is it allowed to send an in-dialog request while a previous in-dialog request (in same direction) has no final response? On 4/10/12 11:25 AM, Nataraju A.B wrote: >> 2) IN-DIALOG-1 = INVITE, IN-DIALOG-2 = INVITE >> >> What should reply bob for the second INVITE? >> > [ABN] this is an incorrect behavior from UAC. because this (2nd INVITE) > lead to overlapped offer-answer request. In this case it is expected that > UAS reply with 491 Request pending. Its incorrect, but not for that reason. According to 3261 section 14.1: Note that a UAC MUST NOT initiate a new INVITE transaction within a dialog while another INVITE transaction is in progress in either direction. The proper response to use in this case is open to discussion. 491 doesn't seem like the right response - it is for glare (requests in opposite directions). In the absence of a better choice I think probably 400 applies. (But I wouldn't get too upset with an implementation that chose some other 4xx, including 491.) Thanks, Paul _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
