Hi,
In my case error: ISDN Se2:15 **ERROR**: call_cleared: VOICE ERROR: NULL VDEV Common(0xFC): bchan -1, call id 0x8054 occured because of wrong dial-pattern (I dialed wrong number of digits to terminating gateway, f.e. I dialed 0123456789 while I was to dial
123456789)
I hope this will help;
Regards