[Sip] Dialog independent session control response

["Alexeitsev, D" <D.Alexeitsev@telekom.de>]

Hello All

The UPDATE method was defined for the dialog independent control of the session. Would it not be necessary to define an equivalent provisional response, that would allow to control the session without impacting the dialog state?

As currently the 183 response is widely used for this proposes and it's actually not clean in terms of call and bearer control separation.
 
Greeting,
Denis Alexeitsev 

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