[Sip-implementors] Doubt on inclussion of Contact header in 200 OK to deregistration

Tue, 05 May 2009 07:02:04 -0700 

Hi
A user agent registers against a REGISTRAR; so a 200 OK response is 
generated and includes a Contact header with the binding included in the 
request.
No more bindings are stores in the registrar for this sip user.
The user agent starts a deregistration procedure (i.e. REGISTER with 
Expires=0). How shall the registrar build the 200 OK response assuming no 
binding is left? I guess the 200 OK MUST include a Contact header, even 
though no binding is left, right?
Regards
Javier F.
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