Hi,

 I have a question about To Tags in register messages.

Does the UA need to maintain the To tag received in a Registration
response(sent by the registrar) and include it in any subsequent
registration refreshes?

Does it need to maintain the To tag received in a registration response(200
for Registration) for any reason?

Also,  RFC 3261 states 

In section 10.2 :  "A REGISTER request does not establish a
dialog." and 

In section 8.1.1.2 says "A request outside of a dialog MUST NOT
contains a To tag". 

Do the above statements imply that a registration message (refresh/
otherwise) should never carry a TO TAG.

Would really appreciate it if someone could please clarify.

Thanks,
pavitra

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