I have been using asterisk with voiptalk and a 3com router which was working well except no QoS. I have now changed to a Draytek 2800VG but cannot get it to work properly.
The asterisk box is on a Lan (192.168.1.5), on the 3com router port 5060 and 4569 were forwarded to the asterisk ip address. The same settings on the 2800VG result in incoming calls via sip not arriving at the asterisk box at all, outgoing calls can be setup but there is no audio.
Can anyone suggest what I need to do differently on the 2800?