I'm using linphone to connect to a SIP telco in Germany (sipgate.de).
This allows me to have a real phone number and to call POTS phones.
The setup:
SIP Gateway --- Internet --- Router --- Workstation/linphone
The router is configured to forward ports 5060/udp, 7078/udp and
7079/udp to the workstation.
Establishing a connection works. Audio is working in both directions -
at least in the beginning.
After a while - this varies from about a minute to several minutes -
the incoming audio gets scattered and then lost. The remote partner
(which sits on the POTS network and is routed by sipgate) can still
listen to what I say but I can't hear him. iptraf still shows incoming
and outgoing traffic.
I have tested X-Lite on a Windoze notebook and this shows no problem
at all. I can talk for a long time. I also tried an H.323 connection
(peer to peer from one Linux machine to another) to test if there is
some general network problem - this is not the case...
Did anybody already encounter this problem (and hopefully solve it)?
Any ideas on what I could try to get it working stable? The audio
quality is pretty good and I would really like to use it regular and
get rid of my POTS phone...