oder besser:
ich schreib mal, was ich so gemacht habe:
extensions.conf:
[internal]
....
exten => 502,hint,ZAP/1
....
exten => 502,1,Dial(ZAP/1)
....
zapata.conf:
callerid="Muster" <502>
;context=internal
callgroup=502
pickupgroup=502
signalling=fxo_ks
channel => 1
snom...