Customer has a Legend Cabinet with Magix R4 processor, 1 408 MLX, 1 08 MLX, 007 VM.

Problem: Any user is making a outgoing call. Dialing a call. A incoming call drops the call before its completed. The incoming call can be answered.

Last 99 alarms. "All TTR's unaviable.
Code 0C03

I changed the 408 card because I had one with me.
The carrier checked, on site, the circuits.
I don't think the carrier is the problem. Does not happen with my headset.

Any thoughts: Processor?
Thanks
Ken