Fair enough. Thank you for all the explanation!
On Mon, 11 Feb 2019 at 16:02, Alex Balashov <abalas...@evaristesys.com> wrote: > 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 > -- David Cunningham, Voisonics Limited http://voisonics.com/ USA: +1 213 221 1092 New Zealand: +64 (0)28 2558 3782 _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
