[Serdev] Ser behind a NAT

[George KAPELIOS]

Is anyone able to answer if SER could run without
problems behind a NAT ?

The server is assigned with a private IP address and
port 5060 is open on the NAT router. UAs are able to
register through public IP addresses, but sometimes
there are call setup problems (for example a UA is
keep trying to call a registered user until timeout,
or at the receiver end a new call rings for once or
twice and then call is terminated for "unknown
reason").

Is any other port or range required to be open in the
NAT?

Any knowledge or suggestions?

Thanks,
George