Re: [Sip-implementors] Significance of Route, Record-Route and Path Header Field

[Hemant Pandey]

Dear Ranganathan,          Path is not the obsolete Header field. It is the extension Header field, which has been introduced in SIP REGISTER method to fulfill 3GPP requirement for discovering intermediate proxies during SIP registration. For clear understanding of this you could read RFC3327.   Thanks for your help.   Regards Hemant ----- Original Message ----- From: M. Ranganathan To: Hemant Pandey Sent: Tuesday, March 04, 2003 7:12 PM Subject: Re: [Sip-implementors] Significance of Route, Record-Route and Path Header Field Route - used for explicit routing of  Requests. Record-Route - used by proxies to indicate a desire to be on the signaling path. Converted by UAs to Route headers Path - Obsolete header. Dont worry about it. Dialogs create and maintain Route Sets based on these headers. Hope I have succintly captured the expected behavior but the SIP FAQ should help. A single header cannot do all of the above because they do different things. Regards Ranga. Hemant Pandey wrote: Hi All         I am confused between Route, Record-Route and path Header fields.I am not able to understand their significance and their need in different SIP messages. It seems the these header fields contain duplicate copy of same information.   Could any one help me out to understand significance of these Header fields? Why and when these different Header fields required? Can't a single Header field (Route or Record-Route or Path) solve the purpose of all three header fields? what problems will arise if any one of these header field is missing?   I need ur cooperation to understand these points.   Regards   Hemant   -- M. Ranganathan Advanced Networking Technologies Divsion, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. tel:301 975 3664 , fax:301 590 0932 , http://w3.antd.nist.gov Advanced Networking Technologies For the People!