On Wed, 2010-02-10 at 18:14 +0530, Bala Murugan wrote:
> Can a UAC send RE-INVITE , if a response is pending from UAS for
> UPDATE refresh Request in early dialog .

The UAC cannot send a re-INVITE in an early dialog, because its first
INVITE has not completed.  See RFC 3261 section 14:

   Note that a UAC MUST NOT initiate a new INVITE transaction within a
   dialog while another INVITE transaction is in progress in either
   direction.

Dale


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