CallPath call STLTRAN (Transfer_Call) - unknown problem
STLTRAN failed because of an unexpected or unknown error. The CallPath return code and the parameters passed to and from the call are printed in the error.
STLTRAN completes a transfer operation after an STLXTND (Extend_Call) call has completed.
If this problem occurs frequently, trace it and contact Blueworx Support.
White (error_id = 20501)
Log, System Monitor