On our 4.2.1-018680 system deployed behind a NAT RLS generates dialog 
subscriptions with the following "To" and "From" headers:

From: <sip:[email protected]:56541>;tag=CQfe6P
To: <sip:[email protected]:5060;transport=UDP;x-sipX-nonat>

The "From" header has host part with the private IP address of the sipX system 
instead of the SIP domain. The port is ephemeral port of the TCP connection 
created by RLS. 
The "To" header contains the "contact" of the registered endpoint as derived 
from the reg event subscription including remote NAT parameters (such as 
x-sipX-nonat) appended by the NAT plugin.

Is there a particular reason these headers are formatted this way? Would it be 
possible to drop the port from the "From" header and format the "To" and "From" 
to contain SIP domain of the sipX system in the hostport?

Thanks,
Mark.


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