Dear Expert,

Is it valid to send deRegister request i.e. REGISTER with expires=0 before
receiving final response for previous registration request i.e. REGISTER
with expires >0  ?

As per RFC 3261,
It is mentioned for new REGISTER request only

UAs MUST NOT send a new registration (that is, containing new Contact
   header field values, as opposed to a retransmission) until they have
   received a final response from the registrar for the previous one or
   the previous REGISTER request has timed out.


Thanks,

Parveen
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