Repeat dial functions

Function	Synchronous/ Asynchronous	Description
rdaAttach	Asynchronous	Attaches the repeat dial library to NCC.
rdaDetach	Asynchronous	Detaches the repeat dial library from NCC.
rdaLogCall	Asynchronous	Logs a call attempt into the repeat dial database.
rdaRequestCall	Asynchronous	Queries the repeat dial database to determine if another call to a given address can be attempted.