User's Manual

Voice API Programming Guide — June 2005 175
15
15.R2/MF Signaling
This chapter provides a description of R2/MF signaling protocol. The following topics are
presented:
• R2/MF Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
• Direct Dialing-In Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
• R2/MF Multifrequency Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
• R2/MF Signal Meanings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
• R2/MF Compelled Signaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
• R2/MF Voice Library Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
• R2/MF Tone Detection Template Memory Requirements . . . . . . . . . . . . . . . . . . . . . . 186
15.1 R2/MF Overview
R2/MF signaling is an international signaling system that is used in Europe and Asia to permit the
transmission of numerical and other information relating to the called and calling subscribers’
lines.
Note: R2/MF signaling is typically accomplished through the Global Call API. For more information, see
the Global Call documentation set. The information in this chapter is provided for reference
purposes only. It is not recommended that the voice library functions described in this chapter be
used for R2/MF signaling.
R2/MF signals that control the call setup are referred to as interregister signals. In the case of the
signals sent between the central office (CO) and the customer premises equipment (CPE), the CO is
referred to as the outgoing register and the CPE as the incoming register. Signals sent from the
CO are forward signals; signals sent from the CPE are backward signals. The outgoing register
(CO) sends forward interregister signals and receives backward interregister signals. The incoming
register (CPE) receives forward interregister signals and sends backward interregister signals. See
Figure 22.
Figure 22. Forward and Backward Interregister Signals
The focus of this section is on the forward and backward interregister signals, and more
specifically, the address signals, which can provide the telephone number of the called
subscriber’s line. For national traffic, the address signals can also provide the telephone number of
a calling subscriber’s line for automatic number identification (ANI) applications.
Forward Signal
Outgoing
Register
(CO)
Incoming
Register
(CPE)
Backward Signal