Intel 52377002 15.1 R2/MF Overview

Voice API Programming Guide — June 2005 175

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

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

(CO)

Incoming

(CPE)

Backward Signal