Draft-ietf-sipping-sip-offeranswer-11 section 4.1 indicates sending 491 response with Retry-After. The Retry-After header has not been defined for inclusion within a 491 response. The 491 response has an explicit back-off algorithm discussed within rfc3261 and rfc3311. Within various glare and race conditions, both RFCs discuss sending things like 500 response with Retry-After or a 491 response; however neither indicates to send a 491 response with Retry-After header. Thus concerning section 4.1 of the draft, "491 response with Retry-After header field" should likely be changed to "491 response"; and "491 response with Retry-After" should likely be "491 response". If not changed, what is the purpose of the Retry-After within a 491 response since it would be ignored per rfc3261 and rfc3311? Thanks, Brett _______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP
