[Asterisk-Users] IAX2 hangup on transfer

[Philipp von Klitzing]

Hi!

>> Now it is pretty obvious that my setup is ok since it work half the
>> times.

> Maybe, maybe when the IPs on dynamic servers change, * has different
> information internally hence the transfer fails?

My feeling is that you have a firewall/NAT issue. Look at the qualify= 
paramter and do some reading on NAT in order to make sure your devices 
keep the ports required for SIP operation open at all times. Sounds like 
at the moment those ports are often closed for outside callers.

Cheers, Philipp