[Asterisk-Users] IAX & FWD, No authority found?

[Rich Adamson]

>  Just wondering if anyone can give me some pointers, I'm configuring Asterisk to talk 
to FWD's new IAX service. The asterisk server is behind an iptables NAT Firewall, with 
port 5036 forwarded:
> 
> $IPTABLES -t nat -A PREROUTING -p udp -d $EXTERNAL_IP --dport 5036 -j DNAT 
--to-destination 172.16.20.200:5036
> 
>  I can make outgoing calls just fine, but when I receive an inbound call (FWD call me 
service) I get the following errors from iax2 debug...
> 
> Tx-Frame Retry[-01] -- OSeqno: 002 ISeqno: 002 Type: IAX     Subclass: ACK    
>    Timestamp: 00088ms  SCall: 00002  DCall: 00109 [65.39.205.121:4569]
> Rx-Frame Retry[No] -- OSeqno: 000 ISeqno: 000 Type: IAX     Subclass: NEW    
>    Timestamp: 00009ms  SCall: 00040  DCall: 00000 [65.39.205.121:4569]

FWD uses iax2, and the proper port number to allow in your firewall
is udp 4569 (as shown in the Timestamp line above), not 5036.