Can anyone shed any light on this? I've set up 3 trunks - Voiptalk, Voipfone
and Sipgate. With Voipfone and Sipgate I get 2 way audio but with Voiptalk
the other party can hear me but I can't hear them.

Voiptalk CS won't support trixbox at the moment, although they helpfully
sent me a config that another customer had used successfully. If the problem
was across all Carriers I'd suspect a NAT or port forwarding issue but with
just one I'm scratching my head a bit.

TIA

Liam