Thanks heaps for this link, I didn't know this document existed.
Anyhow, it doesn't really cover our case (or maybe I'm missing something, which is not unlikely

)
I have run all dahdi configuration, and at the end of the day, in the trunklines panels there is the following trunk which appears automatically:
DAHDIGroup0 group LOCAL N/A N/A [Device definition is active] [Click to Edit] [Click to Delete]
Both fields "OPEN" and "CLOSED" are NOT set, when the line rings, all extensions ring as is explained in the manual you sent!
When I edit this trunk, I get 2 tabs, "routing" and "line"
Under routing I find:
Active?
Tenant
Fax detect
Line Pre-select
Switch on CLIP
Transformation mask
Trunkname
Under "Line":
Alpha TagA
Add CLI Prefix
MOH instead of Ringtone
DISA Password
Caller ID
Dial String Lead-in (SET to "DAHDI/g0)
Dial String Lead-out
Call Progress?
So there is no option to set the trunk to "routable" or instruct it where to route the incoming calls....
This is where I'm getting stuck...
Is there anything I need to do with this DAHDI/go under Dial String Lead-In?? Do I need to create another trunk that makes use of this? It read in the manual about this PIKA thing for fxo
Any pointers?
Thanks again
Frank