You are here: CSP Developer’s Guide: Overview > 7 Configuring and Using Resources on the DSP Series 2 Cards > Performing Call Progress Analysis

Performing Call Progress Analysis

Configuration

You must have a DSP configured with a Function Type for CPA:

0x07 - CPA A-Law

0x08 - CPA µ-Law

Initiate

You can initiate call progress in the following two ways:

• During call setup, with the outseize instruction of Do Call Progress Analysis

• Interactively, by assigning a CPA Receiver with the DSP Service Request message using the following values:

Service Type

0x03 - Call Progress Analysis Receiver

CPA Class

0x00 North American Default

0x01 Dialtone

0x02 CPC Detection

0x03 Energy Detection

Host Indications

A Call Progress Analysis Result message is sent to host when a pattern is detected.

A Call Processing Event 0x002E message is sent to host when a CP pattern is detected

Off-hook Detection

When CPA is initiated with the DSP Service Request message, detection of off-hook is reported if the signaling interface supports it.

Digital Signal Processor
PCM and companding standard used in Europe to compress and expand the amplitude range of a signal before and after transmission. See µ-Law.
PCM and companding standard used in North America and Japan to compress and expand the amplitude range of a signal before and after transmission. See A-Law
A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.