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Type 1 Telephony Features Library

MOTOROLA

Introduction

•

Generic Echo Canceller Library

•

Feature Phone Application Software

These modules are designed to interoperate to provide all of the software necessary to implement a feature

phone with full duplex speakerphone and Type 1 and 2 Caller ID functionality. Using some or all of these

modules, several other types of telephony applications are also possible. Each module may also be used

independently.

1.3 Overview of the Type 1 Telephony Features

Library

Customer Premises Equipment (CPE) using the Type 1 Telephony Features Library has the features to sup-

port existing on-hook Caller ID services, such as Calling Number Delivery and Calling Name Delivery;

other existing on-hook services, such as Visual Message Waiting Indicator (VMWI) or Call Qualifier

(CQ); as well as future services that would use the on-hook GR-30-CORE Voice band Data Transmission

Interface from the Public Switched Telephone Network (PSTN). Type 1 CPE supports on-hook signaling

with or without power ringing and can decode data frames packaged in the GR-30-CORE Single Data

Message Format (SDMF) or Multiple Data Message Format (MDMF), depending on the needs of the spe-

cific telephony service supported, as described in Telcordia SR-3004 and other referenced service-specific

documents.

While this module is primarily intended to be used for Caller ID reception, other convenient features have

been added to allow for simple integration into a Caller ID telephone. While the module is in an on-hook

state, ring generator samples may be created during power ringing. These samples may be output to an

audio channel (for example, to be played to a speaker). While the module is in an off-hook state, DTMF

samples may be generated for dialing digits. Timing for a line flash is also provided.

The Caller ID is received between the first and second ring. The content displayed should include date,

time, and the directory telephone number and/or the name of the caller. Other existing service-specific con-

tent may also be displayed, such as Call Qualifier displays. The service-specific content of future services

may be displayed when these become deployed in the PSTN.

VMWI may be transmitted with or without power ringing, but must be received without power ringing.

The CPE is instructed by the data received in GR-30-CORE format to turn a light or other visual indicator

on or off, indicating that new messages have been received at a voice mail system or other messaging ser-

vice.

The performance of CPE that incorporates the Type 1 Telephony Features Library (also called the Type 1

Library module) complies with the transmission layer requirements of Telcordia SR-3004, including those

for:

•

Frequency Shift Keying (FSK) modulation sensitivity

•

Twist, or level differences between FSK signal tones

•

FSK frequencies and variation from their nominal values

— In addition to complying with the FSK modulation frequencies of SR-3004, the Type 1

Telephony Features Library can also detect FSK transmitted using the slightly different

frequencies specified by the ITU-T V.23 modem recommendation. However, the Type 1

Telephony Features Library cannot be used directly in equipment for international telephone

networks with V.23, since the timing protocols are likely different.

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

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