[Serusers] ACK

[Sebastian Kühner]

Hello,

I have two phones behind a Port Restricted Cone NAT (both in the same
private area) and ser is running with another public IP.

I want to call from one of those phone to the other. The call is set up and
I can talk, but one Softphone shows me the message: "Waiting
acknowledgement..."... and all followed SIP messages don't reach the other
phone. I'm using a STUN server.

Call from 14 at xxx.xxx.xxx.xxx:5060 to 13 at xxx.xxx.xxx.xxx:1024:

14 -> ser:
----------
IVITE 13 at ip.of.ser.xxx@5060  (Contact: 14 at 192.168.1.101:5060)

ser -> 13:
----------
INVITE 13 at xxx.xxx.xxx.xxx:1024 (Contact: 14 at xxx.xxx.xxx.xxx:5060)

13 -> ser
---------
Trying and ringing (Contact: 13 at xxx.xxx.xxx.xxx:5060)
(!!!!!!!!!!! <-- wrong port !!!!!!!)

13 -> ser
---------
OK (Contact: 13 at xxx.xxx.xxx.xxx:5060)
(!!!!!!!!!!! <-- wrong port !!!!!!!)

ser -> 14
----------
OK (Contact: 13 at xxx.xxx.xxx.xxx:5060)
(!!!!!!!!!!! <-- wrong port !!!!!!!)

14 -> ser
----------
ACK 13 at xxx.xxx.xxx.xxx:5060

ser -> 14
---------
ACK 13 at xxx.xxx.xxx.xxx:5060

14 -> ser
----------
ACK 13 at xxx.xxx.xxx.xxx:5060

... and so on... until timeout.

Does anybody know what is the problem... or better: the solution?

Thanks!

Sebastian