[OpenSIPS-Users] Delete alias references in SIP messages

[Bogdan-Andrei Iancu]

Hi Olle,

it is good to know we are still RFC compliant even if we allow the 
changing of the FROM - to be honest I was not aware of the RFC4916, 
neither of the backdoor from the RFC3261.

Thank you for the hint! i will consider adding the TO changing also (in 
the same way as FROM changing).

Thanks and regards,
Bogdan

Johansson Olle E wrote:
>
> 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