From: "Jackson, James" <[EMAIL PROTECTED]>

   Consider an attended transfer in which call1 is established between a
   transferee and a transferor. The transferor creates a new call2 towards
   transfer target. While this call is still alerting (early dialog), it
   sends a REFER on call1 with a Replaces header that references call2. In
   this case, the Replaces header attempts to replace an early dialog which
   was "terminated" by the target.

That is not allowed by RFC 3891.  But suppose it was allowed.  Further
suppose that the transfer target rings for another 90 seconds (sending
an additional 180) and then the proxy that manages the transfer target
cancels the call, causing the transfer target to send a 487.  Who
receives the 180 and 487?

Dale


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