Call holding, retrieval, and transfer functions

Function	Synchronous/ Asynchronous	Description
nccAutomaticTransfer	Asynchronous	Performs a blind call transfer.
nccHoldCall	Asynchronous	Puts a call on hold.
nccRetrieveCall	Asynchronous	Retrieves a held call.
nccTransferCall	Asynchronous	Performs a supervised call transfer or a two channel call transfer.