[SR-Users] early media: How to change to tag

[Andreas Granig]

Hi,

On 03/28/2012 06:37 PM, Iñaki Baz Castillo wrote:
> 2012/3/28 Min Wang <ser.basis at gmail.com>:
>> In order to properly proxy the msg to GW1, Kamailio seems need to change the
>> to tag from B to A.
> 
> Totally wrong. Multiple (early-)dialogs are 100% valid according to
> RFC 3261. If you find some SIP device failing when it receives
> multiple 180/183/200 responses with different To-tag, then drop it

I recently learned that for example Siemens switches implement "Request
Disposition: no-fork" defined in http://www.ietf.org/rfc/rfc3841.txt,
and if for some reason you decide to fork nonetheless on your side,
you'd probably want to do something about the different to-tags
(although you're violating against that specific RFC then). No idea how
such a device would react to not getting a to-tag at all by stripping it
out as Klaus suggested in another response, but at least that Siemens
switch doesn't bail out on getting different to-tags in provisional replies.

Andreas

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