It seems a number of phones have separate settings for "SIP Server" and "Outbound proxy".
More specifically, the Linux X-Lite softphone I've been playing with has "SIP Proxy" and "Out Bound Proxy" settings, and it seems the GrandStream BudgeTone 100 has "SIP Server" and "Outbound Proxy"; see http://siproxd.sourceforge.net/siproxd_guide/siproxd_guide_c6s2.html Now, my question is: what exactly is the distinction? Reading RFC 3261, the concept of an "outbound proxy" is clearly defined - all outbound SIP packets will have their destination set to this address. I'm fine with that. But what's the separate "SIP Proxy" or "SIP Server" setting for? By a process of experimentation on X-Lite, I have determined: * All outbound requests are sent to the "outbound proxy", unless I have set "use outbound proxy: never", in which case they're sent to the "SIP proxy" * I don't see any other circumstance in which the "SIP proxy" setting is used. I've done some tcpdumping of SIP traffic, and may have missed something. However if I point the "SIP server" setting to some other host in my network, I don't see its address being used at all - neither registration nor call origination. More specifically: if I set the "Outbound proxy" to 10.69.255.251 (an Asterisk server), and the "SIP proxy" to 10.69.255.252 (another PC), then all REGISTER and INVITE requests are sent to 10.69.255.251. No packets are sent to 10.69.255.252, and as far as I can tell, none of the packets to 10.69.255.251 include 10.69.255.252 in their contents either. So I don't understand what the other "SIP Proxy" or "SIP Server" setting is for, and I couldn't find that info on voip-info.org or google. If anyone could explain, clearly and precisely, how this setting is used by the client (in terms of how it affects the SIP exchanges), I'd be very grateful! Many thanks, Brian Candler. _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users