On 08/05/13 15:13, Keerthi Srinivasan wrote:
> Registrar receives the REGISTER request with no contact header and 
> expires header with 0. what registrar has to do? it has to fetch all 
> the binding for the AOR or deregister binding? can any help me? 

 From "RFC3261, Section 10.2 Constructing the REGISTER Request"

     The following header fields, except Contact, MUST be included in a
     REGISTER request.  A Contact header field MAY be included...


Regards,
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