Vishal,
The From and To tags are used to identify a dialog, the UAC which
forms the request will append a tag to the From field and the UAS which
responds (like your 200 for the SUBSCRIBE below) will append a tag to the
To field (which is why you don't see it in the request - SUBSCRIBE /
INVITE).
It would be good to know that you are having a read of the standards
documents before asking the recent questions to the Implementors group, if
you are unsure what documents to read or have read them but still have
questions then fire away.
Hope the above helps - Wayne.
Vishal asked:
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hi
when the subscriber sends a subscribe request,200 ok is the response
200 ok contains a tag in the "TO" field like
To: <sip:[EMAIL PROTECTED]>;tag=ffd2
what is the meaning of the tag =ffd2
and why this "To" TAG is not used when THERE IS SUBSCFRIBE REQUEST OR THE
INVITE.
VISHAL
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