Hi,
can you check following :
SERV-Parameter of extension :
D5 Direct in-dialing characteristics
0 Blocked for traffic from public exchange.
1 Open for traffic from public exchange.
2 A-subscriber will not be charged on answer.
TRAF-Prameter of extension and incomming route:
D7 D8 Traffic Connection class
TCMAP:CON=T;
Check traffic connection matrix, if the connection between trunk and this extension is allowed
best regards,
Norbert