I solved this issue by replacing the router (Netgear RP 614) with a newer model (Netgear DG 834 B). It seems the old router had occasionally problems to forward the UDP-ports to Asterisk. However, I'm glad everything works now! Thank you for your help!

Regards, Lius

I'm experiencing a strange problem with my Asterisk. I hope you can help:

Asterisk is running at my company behind NAT. Ports 5060 and 10000-20000 are being forwarded to it. I have put the router's external IP-address into externip in sip.conf. At home I'm using an AVM FritzBox Fon WLAN 7050 which is registered with the Asterisk at my company.

When I try to call Asterisk (or a phone connected to the attached legacy-pbx) from home, it's ringing normally and I can hear my opposite. But it takes about 20 seconds until my opposite hears me! When I call the same number again staight after, everything is working fine from the beginning. Also, calls from the company to my home are working perfectly.

I'm greateful for any tips!

One way to identify the issue is to run ethereal to see what's happening
with the udp ports. If that doesn't provide a clue, then run asterisk
with additional levels of debug/verboseness.


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