The Path header allows a set of proxies to insert themselves between the UA and Registrar. The proxy addresses carried in Path headers are augmented to the AOR-Contact binding such that the path-recording proxies can be traversed back when someone needs to reach that UA.
If you're building a Registrar and you ignore Path headers in a REGISTER request, then the AOR-Contact binding information that you'll maintain will be somewhat useless. The Registrar will not know which set of proxies to route through to reach the UA. In other words, calls made to the UA will fail to reach the UA. If you're building a Proxy and fail to add a Path header when the network topology dictates that you must, then the route set between the UA and the Registrar will be broken and once again calls destined to the UA will most likely fail to reach the UA. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of karthik Sent: Thursday, March 23, 2006 11:13 PM To: Paul Kyzivat Cc: [email protected] Subject: Re: [Sip-implementors] Reg SIP PATH header Hi, Kindly tell me PATH header extension is needed?What will we loose if we dont use that extension? Thanks & Regards, Karthik. On Thu, 23 Mar 2006 10:01:28 -0500, "Paul Kyzivat" <[EMAIL PROTECTED]> said: > In IMS, the Path header is *the* way the S-CSCF knows which P-CSCF is > assigned to a given registered UE. > > Paul > > karthik wrote: > > Hi all, > > > > Can any one of you tell me why SIP PATH header extension is needed? > > What is the advantage of using it in Registration? > > What is the significance of this extension in IMS network? > > > > Any help will be appreciated. > > Thanks in Advance. > > > > -- karthik [EMAIL PROTECTED] -- http://www.fastmail.fm - Email service worth paying for. Try it for free _______________________________________________ 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
