Thanks to all for your help and Tony's great Trixbox 2 setup document, I now have a working Trixbox installation on a dedicated box. The installation appears to work great including the VFX link via an x100p and the WAG54GP2 router with its inbuilt FXS ports.
One question I have is this - with my old Panasonic PABX, I had the comfort of being able to dial 9 for an outside line, then to get a dial tone from the POTS exchange before dialling the number I wanted. Is it possible to duplicate that functionality with Trixbox? I guess that would make Outbound Routes difficult to implement, but perhaps there's a way that a dial string of say "9" could connect to the ZAP/G0 trunk (ie VFX) and then just pass anything dialed into that connection.
Can this be done?
Cheers Mike