Martin,
Now that you have returned, please tell us more about how Voxalot modifies SIP packets when Symmetric NAT Handling is set to 'Yes'.
It looks as if Voxalot is failing to fully replace the "Connection Information" line, as I expect it should, when Symmetric NAT Handling is set to 'Yes'. The result is two "Connection Information" lines which may confuse some user agents, hence the problem reported here by jdstroy.
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