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Call Setup

Digit Collection During Call Setup

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

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.

International Call
Progress Analysis

The CSP can transmit and receive international tones, including a 400 Hz tone used outside of North America.

Reporting Call Progress Tones

Detected call progress tones can be reported to the host 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.

System Maximum for call progress tone detection lists the maximum quantities for call progress tone detection in the CSP.

Table 8-5 System Maximum for call progress tone detection

Tone Specification | System Maximum
--- | ---
Patterns | 30
Classes | 15
Patterns per class | 15
Frequencies per tone | 2

Receiving Call Progress Tone Patterns

The algorithm for detecting call progress tones has the following two phases:

1. Pattern Detection – The first phase recognizes the pattern, based on the tones and cadences received.

2. Pattern Match – The second phase counts tone intervals, to confirm the presence of a pattern. The number of intervals to match is specified by the pattern’s Interval Cycles to Match parameter.

The algorithm does not move to the second phase until the pattern is identified. Configurable timers determine the maximum time to remain in each phase.

The CSP scans for call progress tones in the specified class, and reports them in the CPA Result message. CPA terminates upon reporting a result.

Directory Number Information Service
See Automatic Number Identification.
ANI. This feature allows a host to request the call originating number (calling party number) from networks that support Automatic Number Identification such as AT&T MultiQuest.
Hertz
Digital Signal Processor
A tone sent to the caller indicating the progress of the call. Examples include dial tone, busy tone, ringback tone, and comfort noise (digital cellular).