FWIW, I've noticed an unusual entry or two in the Xten v1.x field to the right
of "Sip Proxy" that has caused problems like this. When I change that entry
to read "host.mydomain.com:5060" it works properly. Since I've really never
paid any attention to what was there previously or how it got there, just
verify this isn't your problem since part of that goes off-screen with large
host/domain names.
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The only way I have ever gotten Xten v1.0 or 2.0 to
work with SER is to set
the "Send Internal IP" field to "On". Even without NAT involved. Once
I did
that it worked fine ever since for me.
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You are better off to contact X-Ten instead, because
it is clearly a
problem with X-Lite, not SER.