Re: [Serusers] How to change INVITE From field

Olaf Bergmann wrote: Out of curiosity, is this just a limitation because of the way SER handles it? Reading 2543, I simply see: "Call-ID, To and From are needed to identify a call leg. The distinction between call and call leg matters in calls with multiple responses to a forked request. The format is similar to the equivalent RFC 822 [24] header, but with a URI instead of just an email address." There's a reference that the tag header MAY (or may not) be used in a URI, but MUST be used if one is to identify unique calls from the same location, which to me implies that the important part of the From/To headers for identification is the tag. "The "tag" MAY appear in the From field of a request. It MUST be present when it is possible that two instances of a user sharing a SIP address can make call invitations with the same Call-ID." The implication of this is that the ENTIRE From/To headers are not necessarily immutable, as the tag is used to identify them as unique. The question is, is there something elsewhere which contradicts this (and therefore enforced the rule of immutable From/To headers), or is this just a SER idiosyncrasy? If it's just a SER thing, might it not be different in other systems (something we might have to watch out for), or might it not be coded around within SER to allow modification of the From header? While I'm not in a rush to go out and change headers, I was just curious. N.