It should not change during the call. The rules prohibit that. The only way to change the remote target address within a dialog is, ironically, via a reinvite and/or response, but that would need to come from the UA itself. <br>
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Your best bet to ensure that the NAT pinhole to the endpoint does not go away during the call is some sort of keepalive, be it the NAT &quot;ping&quot; functionality of the nathelper module or the in-dialog OPTIONS pings from the dialog module. That should keep the NAT mapping refreshed. <br>
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If the endpoint still becomes unreachable, there&#39;s not much you can do. Nothing that would conform to the protocol state machine, anyway. :-) <br>
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--<br>
Alex Balashov | Principal | Evariste Systems LLC<br>
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