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