[asterisk-users] SIP: difference between Grandstream and Cisco when behind NAT

[Benny Amorsen]

Gordon Henderson <gordon+asterisk at drogon.net> writes:

> Hm. Drayteks are on my list of modems to turn any SIP ALG off on! You must 
> have a goodun :)

Drayteks do indeed mess with SIP packets. If you keep STUN/ICE off on
the phone and let Draytek mangle the packets, there is a chance that
things will work. If the phone uses STUN/ICE, the Draytek will almost
certainly stop things from working.


/Benny