What if the Previous REGISTER(expires > 0) lost in the network, and the REGISTER with expires = 0 might reach the REGISTRAR first in this case REGISTRAR will not find the active registration, so end up with 4xx response.
Regards Srinivas -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Parveen Aggarwal Sent: Wednesday, June 28, 2017 10:41 AM To: sip-implementors@lists.cs.columbia.edu Subject: [Sip-implementors] Sending deRegister request just after sending REGISTER request Dear Expert, Is it valid to send deRegister request i.e. REGISTER with expires=0 before receiving final response for previous registration request i.e. REGISTER with expires >0 ? As per RFC 3261, It is mentioned for new REGISTER request only UAs MUST NOT send a new registration (that is, containing new Contact header field values, as opposed to a retransmission) until they have received a final response from the registrar for the previous one or the previous REGISTER request has timed out. Thanks, Parveen _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.cs.columbia.edu_mailman_listinfo_sip-2Dimplementors&d=DwICAg&c=BFpWQw8bsuKpl1SgiZH64Q&r=DfcjuTVsKgmJaaUkoM6ILHncIUfFzD1YvkhqXoTJ3oE&m=GfL4qOD1hrOoOz-iubTqqxkfDYYxZfSjZbnYyPbrRKA&s=Yley5vwhmX2fXslDVs3mS3hSp9ddYoA20hhRBMh-WB8&e= _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
