Address Signaling Tones

This section describes the different types of Address Signaling tones.

Digit Collection During Call Setup

During call setup, the CSP can collect DTMF, MFR1, and MFR2 (Forward and Backward) digits.

For MFR2 transmission and reception, any card with an MFR2 receiver must also have an MFR2 forward and backward transmitter. If only MFR2 receivers are present, an incoming call causes a DSP Function Not Configured alarm and the MFR2 receivers are not used.

DNIS and ANI Identification

You can program the CSP to automatically collect the inpulsing address data that typically accompany an incoming call. This information identifies the Dialed Number Identification Service (DNIS) and/or the Automatic Number Identification (ANI). A service application can use this data to validate and authenticate subscribers, and to identify service.

Programming Digit Collection

To program digit collection during call setup, the host uses a combination of the DSP SIMM Configure, Inpulsing Parameters, and Inseize Control messages.

DSP SIMM Configure

This API message configures the function of an individual DSP chip. Tone reception functions include DTMF, MFR1, MFR2, and E1 Dial Pulse reception (E1 Dial Pulse is not available on the DSP Series 2 card).

Inpulsing Parameters Configure

This API message configures parameters for collecting inpulse data on specified channels. Inpulsing parameters define the address signaling type, the number of digit strings, and the collection method used during call setup.

The CSP supports four different inpulsing stages, each with one or two digit strings. When the host is instructing the CSP to collect address signaling information (that is typically presented with in-band dual frequency tones) it also specifies a preprogrammed inpulsing stage that describes how to perform the digit collection. The inpulsing stage configuration options include the following:

• Address signaling type (DTMF, MFR1, MFR2)

• Number of strings (1 or 2)

• String collection method (fixed number digits, KP/ST framed, compelled)

Inseize Control

This API message passes inseize instructions to the CSP for controlling incoming call setup in real time. The instruction, "Receive Stage N Address Data" allocates and attaches a DSP resource to a channel to collect an incoming digit stream. Up to 100 digits can be collected within a given inpulsing stage. Use the Inseize Instruction List Configure (0x0029) message to preprogram instructions on a channel. See "Digit Collection During Call Setup" for more information.

Important! The instruction, Report Incoming Call With Address Digits, sends a Request For Service With Data (0x002D) message to the host, with single- or multiple-stage digit streams collected.

Digit Collection After Call Setup

After a call is set up, the CSP collects DTMF digits interactively. The host collects additional information, either one digit at a time with the DSP Service Request message, or as a sequenced group of digits with the Collect Digit String message.

DSP Service Request

This API message allocates an appropriate digit receiver and attaches it to the specified channel. The attached digit receiver uses the Call Processing Event message to report digits as they are decoded, one at a time. The receiver remains attached to the channel until the channel is released or until the host cancels digit collection, with the DSP Service Cancel (0x00BE) message.

Collect Digit String

This API message allocates and attaches a digit receiver to a channel, but unlike the DSP Service Request message, it causes the CSP to collect a group of digits in sequence until termination condition occurs. The termination condition could be the detection of a particular digit from a termination digit set, a fixed number of digits collected, or a timeout.

When the termination condition occurs, the CSP reports the entire group of digits collected, with the Call Processing Event message. The receiver is then returned to the system receiver pool. If the configuration bit 4 is not set (or "by default") when the CSP detects the first valid digit, it automatically cancels any prompting tone or recorded announcement being played out to that channel.