asterisk users - Mar 2006 - 20 seconds til voice transmission starts

Hello everybody,

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!

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.