I connected 1232 with a cisco router trough kxtd 280 2 port ISDN BRI- S0. I can make calls from the router to PBX but not the other way. I connected the ISDN ports as trunks and when I call from Cisco IP phone I can see that the call is comming from line 11. Still I can't access CO11 from any extension from PBX , CO11 it doesn't exist. Can somebody help me?