TUP service function summary

The TUP service consists of the following functions:

Function	Description
TUPADDRtoASCII	Changes a packed string of digits (appropriate for the information elements that require an address string) to an ASCII string of digits.
TUPASCIItoADDR	Changes an ASCII string of digits (to dial) to a packed structure of digits appropriate for the information elements that require an address string.
TUPConnectReq	Requests the establishment of a circuit switched connection.
TUPConnectResp	Signals the far exchange that an incoming call was answered.
TUPConnectStatusReq	Sends connection status information to the far exchange during the connection establishment phase.
TUPGetApiStats	Retrieves congestion level activity statistics from the TUP service.
TUPReleaseReq	Clears or denies the establishment of a circuit switched connection.
TUPReleaseResp	Responds to a release indication from a far exchange.
TUPRetrieveMessage	Retrieves (and optionally waits for if none is currently available) the next message from the TUP layer.
TUPStatusReq	Sends a global or circuit-specific message to the far exchange.