Hi, I have seen in some phones if outbound proxy is configured, then all the request sent by that phone in the same dialog is going through that proxy.
I have a question, what is the usage of out bound proxy in practical terms? And what is the difference between proxy and outbound proxy? Thanks, Anil -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Attila Sipos Sent: Thursday, April 20, 2006 2:17 AM To: [email protected]; [EMAIL PROTECTED] Subject: Re: [Sip-implementors] Outbound Proxy A long time ago I posed a question regarding when the outbound proxy should be used. The (very helpful) answer is below. In summary the answer given was: >> In a practical implementation scenario, a UA will send >> >> * the 1st INVITE, >> * the CANCEL for that INVITE and >> * all REGISTER requests >> >> to the configured out-bound proxy server network >> address and at the >> configured out-bound proxy server transport port. Now recently I have been told that the ACK of the 1st INVITE should also be sent to the outbound proxy. The scenario is: endpointA OB-proxy INVITE----------> <-------------100 <-------------180 <-------------200 ACK-----------------------> the ACK destination is the Contact in the 200. None of the INVITE responses contain any Record Route headers. So this is another outbound proxy question.... It was my belief that it is correct to send the 1st INVITE's ACK to the destination derived from the Contact (in the absence of RR headers). I also believe that, if proxy wants to get the ACK, it MUST provide a RR header with itself. But someone else believes that the 1st INVITE's ACK should be sent to the outbound proxy (in the absence of RR headers). Who is correct? Many Thanks in advance, Attila Attila Sipos http://www.vegastream.com >> -----Original Message----- >> From: Jerry Ipe Thomas [mailto:[EMAIL PROTECTED] >> Sent: 20 October 2004 07:10 >> To: Attila Sipos >> Cc: SIP Implementors Mailing List >> Subject: RE: [Sip-implementors] Outbound Proxy >> >> >> Hi Attila, >> >> If an outbound proxy server is configured for a UA, the >> 1st outgoing >> INVITE should go to the out-bound proxy server at the >> configured network address >> and transport port. Thereafter, *if and only if* the OB >> proxy *wishes* to remain >> in the signaling path, it should "Record-Route" the INVITE >> when proxying it to >> the next hop so that all requests/responses within that >> INVITE-created dialog >> will traverse that OB proxy. The UA must then handle dialogs >> as described (in >> detail) in RFC 3261, section 12 and RFC 3263 (normal UA operation). >> >> If the early dialog is to be CANCELed, then the CANCEL >> must also go to >> the original INVITE destination, here the outbound proxy, at >> the same network >> address and the same transport port. >> >> In a practical implementation scenario, a UA will send >> >> * the 1st INVITE, >> * the CANCEL for that INVITE and >> * all REGISTER requests >> >> to the configured out-bound proxy server network >> address and at the >> configured out-bound proxy server transport port. >> >> Warm Regards, >> >> Jerry Ipe Thomas >> Engineer (R&D) >> D-Link India Ltd. >> Software and R&D Center >> #65, 35th Main >> 100 ft. Ring Road >> 2nd Stage, B.T.M Layout >> Bangalore - 560068 >> PSTN: +91-80-26788350/1 Ext: 117 >> Cell: +91-9886442530 >> >> >> -----Original Message----- >> From: Attila Sipos [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, October 19, 2004 6:25 PM >> To: [email protected] >> Subject: [Sip-implementors] Outbound Proxy >> >> >> >> Hello all. >> >> As fas as I understand, if a UA is configured to use an >> "Outbound Proxy", the UA will send its requests to the >> OutBound Proxy. >> >> Is this the case for ALL requests? >> If the Route set says send it somewhere else, should the >> UA still send the request to the OB Proxy? >> >> >> What about responses? >> I guess all responses should just go back to the destination >> indicated by the top Via. Is this correct? Or should responses >> go via the Outbound proxy too? >> >> >> Regards, >> >> Attila >> >> >> >> >> >> >> >> >> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
