# Telephony protocol functions

Function | Synchronous/ Asynchronous | Description
--- | --- | ---
nccStartProtocol | Asynchronous | Loads a trunk control program (TCP) on AG or CG boards or a dynamic link library (DLL) on QX boards, and enables the use of functions requiring DSP resources.
nccStopProtocol | Asynchronous | Halts the TCP on the line, terminates functions on the line, and unloads the TCP.