[OpenSIPS-Users] Delete alias references in SIP messages

[Johansson Olle E]

12 aug 2008 kl. 23.17 skrev Bogdan-Andrei Iancu:

> Hi Guillaume,
>
> Changing TO header is more or less against the RFC3261 and you should
> not do it. More or less the same discussion as for the FROM header.
Actually this is against SIP version 1, not really SIP version 2 in  
RFC3261.
There is a new RFC that change the From headers for caller ID
updates (which is a change of RFC3261 that kept this just for backwards
compatibility).

 From RFC4916:

" This solution involves changing the URI (not the tags) in the To and
    From header fields of mid-dialog requests and their responses,
    compared with the corresponding values in the dialog forming request
    and response.  Changing the To and From header field URIs was
    contemplated in Section 12.2.1.1 of RFC 3261 [1], which says:

       "Usage of the URI from the To and From fields in the original
       request within subsequent requests is done for backwards
       compatibility with RFC 2543 [6], which used the URI for dialog
       identification.  In this specification, only the tags are used  
for
       dialog identification.  It is expected that mandatory reflection
       of the original To and From URI in mid-dialog requests will be
       deprecated in a subsequent revision of this specification."

    This document therefore deprecates mandatory reflection of the
    original To and From URIs in mid-dialog requests and their  
responses,
    which constitutes a change to RFC 3261 [1]."

This RFC describes ways to update Caller IDs during a call.

/Olle
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