On Mon, Feb 11, 2019 at 03:50:01PM +1300, David Cunningham wrote: > Is that the case always, or only when they're in response to a 200 OK?
There are two kinds of ACKs; end-to-end ACKs (in response to dialog-establishing 2xx responses of an invite transaction), and hop-by-hop ACKs (in response to negative transaction replies which require a reliable acknowledgment). The latter are independently emitted on a hop-by-hop basis, so every proxy in the chain would emit its own downstream while absorbing the upstream ones. But in answer to your question, they are still requests, not replies. Only replies are replies: SIP/2.0 xxx Reason String -- Alex -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
