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!