At 18:30 19/10/2007, samuel wrote:

SIP version 1 (2543) used From header to identify the dialog so it's not recommended to change the From header to be backwards compatible (is there any RFC 2543 SIP endpoint around??...). SIP Version 2 (RFC 3261) uses tags to identify dialogs so you should be able to change the FRom header except the tag.

and mandates backwards compatibility at the same time, which gets you back to square 1.

Recently there was an RFC 4916 that specifies how to identify the connected identity and how to make a change in the From but I think this is far beyond what you are trying to achieve.

I'm adraid there are too many fascinating extensions in such quantity that many have stopped taking care of those (sometimes for a good reason)

There are additional headers (Remote_PartyID, and related) that can be used to specify an identify of the calling party..

asserted identity being most adequate nowadays, I guess.

-jiri

-- Jiri Kuthan http://iptel.org/~jiri/