Hi, > UAC (Caller) UAS(Callee)
As an fyi, the UAC/UAS labels within the figure are not accurate since requests are sent is both directions. User Agent Client and User Agent Server are defined within RFC 3261 section 6. > 1. Can the refresher value be changed in the SE header > of the above mentioned UPDATE by Callee? Yes; see sections 7.1 and 7.4 for initial refresh and subsequent refresh recommendations. If I recall correctly, the RFC doesn't provide a recommendation which would explicitly cover your example (i.e. sending UPDATE during INVITE/re-INVITE when session-expires has not yet been activated). > 2. What are the values that can be sent in 200 Ok (UPDATE) > by the caller? Concerning the example, the refresher value must be uac (i.e. see RFC 4028 section 9). Negotiated refresher becomes callee. > 3. What Callee should send in 200 Ok (INVITE) in the above scenario? Concerning the example, the refresher value must be uac (i.e. see RFC 4028 section 9). Negotiated refresher becomes caller. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
