From: "Amit Lobo" <[EMAIL PROTECTED]>

   Is there any SIP method for a SIP server to know that endpoints are active
   with a call?

A common method for a proxy to monitor a dialog is to apply a
Record-Route header to any dialog-forming INVITE.  Then all later
messages in the dialog will pass through it, and so it can monitor the
state of the dialog.

Dale
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