I have an issue with IP-telephony. Situation is as follows:
There is a FritzBox 7490 making the internet-connection and working as my SIP-gateway (registrar). Behind the 7490 there is a Fritzbox 4040 running OpenWrt as my firewall.
In my LAN I have a softphone (PhonerLite). As recommended I opened the ports 5060-5063 UPD for the SIP-traffic. That works fine. But using PhonerLite after some minutes beeing in a phonecall I get disconnectet. Does anyone know this issue, or is there a way to find out what is going wrong (tcpdump or something like that) ?
thanks in advice