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<DIV><FONT face=Arial size=2>This is pertaining to call cancel operation where
the calling UA sends a CANCEL request via openser to the called UA.
</FONT></DIV>
<DIV><FONT face=Arial size=2>After the UA sends ACK in response to 487
Transaction Terminated response, 487 responses are re-transmitted by openser to
the UA as if the SIP proxy didn't regcognise the ACK request. I have
tested with other UA and compare the differences between the ACK sent by UA that
worked and UA which has this problem. The difference is that the ACK sent by the
UA having this problem has a route header added. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Foon-Yew Kok</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV><pre>
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