User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Revision History
- About This Publication
- 1. Product Description
- 2. Programming Models
- 3. Device Handling
- 4. Event Handling
- 5. Error Handling
- 6. Application Development Guidelines
- 7. Call Progress Analysis
- 7.1 Call Progress Analysis Overview
- 7.2 Call Progress and Call Analysis Terminology
- 7.3 Call Progress Analysis Components
- 7.4 Using Call Progress Analysis on DM3 Boards
- 7.5 Call Progress Analysis Tone Detection on DM3 Boards
- 7.6 Media Tone Detection on DM3 Boards
- 7.7 Default Call Progress Analysis Tone Definitions on DM3 Boards
- 7.8 Modifying Default Call Progress Analysis Tone Definitions on DM3 Boards
- 7.9 Call Progress Analysis Errors
- 7.10 Using Call Progress Analysis on Springware Boards
- 7.11 Call Progress Analysis Tone Detection on Springware Boards
- 7.12 Media Tone Detection on Springware Boards
- 7.13 Default Call Progress Analysis Tone Definitions on Springware Boards
- 7.14 Modifying Default Call Progress Analysis Tone Definitions on Springware Boards
- 7.15 SIT Frequency Detection (Springware Only)
- 7.15.1 Tri-Tone SIT Sequences
- 7.15.2 Setting Tri-Tone SIT Frequency Detection Parameters
- 7.15.3 Obtaining Tri-Tone SIT Frequency Information
- 7.15.4 Global Tone Detection Tone Memory Usage
- 7.15.5 Frequency Detection Errors
- 7.15.6 Setting Single Tone Frequency Detection Parameters
- 7.15.7 Obtaining Single Tone Frequency Information
- 7.16 Cadence Detection in Basic Call Progress Analysis (Springware Only)
- 8. Recording and Playback
- 8.1 Overview of Recording and Playback
- 8.2 Digital Recording and Playback
- 8.3 Play and Record Functions
- 8.4 Play and Record Convenience Functions
- 8.5 Voice Encoding Methods
- 8.6 G.726 Voice Coder
- 8.7 Transaction Record
- 8.8 Silence Compressed Record
- 8.9 Recording with the Voice Activity Detector
- 8.10 Streaming to Board
- 8.11 Pause and Resume Play
- 8.12 Echo Cancellation Resource
- 9. Speed and Volume Control
- 10. Send and Receive FSK Data
- 11. Caller ID
- 12. Cached Prompt Management
- 13. Global Tone Detection and Generation, and Cadenced Tone Generation
- 13.1 Global Tone Detection (GTD)
- 13.1.1 Overview of Global Tone Detection
- 13.1.2 Global Tone Detection on DM3 Boards versus Springware Boards
- 13.1.3 Defining Global Tone Detection Tones
- 13.1.4 Building Tone Templates
- 13.1.5 Working with Tone Templates
- 13.1.6 Retrieving Tone Events
- 13.1.7 Setting GTD Tones as Termination Conditions
- 13.1.8 Maximum Amount of Memory for Tone Templates
- 13.1.9 Estimating Memory
- 13.1.10 Guidelines for Creating User-Defined Tones
- 13.1.11 Global Tone Detection Application
- 13.2 Global Tone Generation (GTG)
- 13.3 Cadenced Tone Generation
- 13.3.1 Using Cadenced Tone Generation
- 13.3.2 How To Generate a Custom Cadenced Tone
- 13.3.3 How To Generate a Non-Cadenced Tone
- 13.3.4 TN_GENCAD Data Structure - Cadenced Tone Generation
- 13.3.5 How To Generate a Standard PBX Call Progress Signal
- 13.3.6 Predefined Set of Standard PBX Call Progress Signals
- 13.3.7 Important Considerations for Using Predefined Call Progress Signals
- 13.1 Global Tone Detection (GTD)
- 14. Global Dial Pulse Detection
- 14.1 Key Features
- 14.2 Global DPD Parameters
- 14.3 Enabling Global DPD
- 14.4 Global DPD Programming Considerations
- 14.5 Retrieving Digits from the Digit Buffer
- 14.6 Retrieving Digits as Events
- 14.7 Dial Pulse Detection Digit Type Reporting
- 14.8 Defines for Digit Type Reporting
- 14.9 Global DPD Programming Procedure
- 14.10 Global DPD Example Code
- 15. R2/MF Signaling
- 16. Syntellect License Automated Attendant
- 17. Building Applications
- Glossary
- Index
Voice API Programming Guide — June 2005 91
Recording and Playback
Note: On Springware boards, voice coders listed here are not available in all situations on all boards, such
as for silence compressed record or speed and volume control. Whenever a restriction exists, it will
be noted. For a comprehensive list of voice coders supported by each board, see the Release Guide
for your system release.
8.6 G.726 Voice Coder
G.726 is an ITU-T recommendation that specifies an adaptive differential pulse code modulation
(ADPCM) technique for recording and playing back audio files. It is useful for applications that
require speech compression, encoding for noise immunity, and uniformity in transmitting voice and
data signals.
The voice library provides support for a G.726 bit exact voice coder that is compliant with the
ITU-T G.726 recommendation.
Audio encoded in the G.726 bit exact format complies with Voice Profile for Internet Messaging
(VPIM), a communications protocol that makes it possible to send and receive messages from
disparate messaging systems over the Internet. G.726 bit exact is the audio encoding and decoding
standard supported by VPIM.
VPIM follows the little endian ordering. The 4-bit code words of the G.726 encoding must be
packed into octets/bytes as follows:
• The first code word (A) is placed in the four least significant bits of the first octet, with the
least significant bit (LSB) of the code word (A0) in the least significant bit of the octet.
• The second code word (B) is placed in the four most significant bits of the first octet, with the
most significant bit (MSB) of the code word (B3) in the most significant bit of the octet.
Table 10. Voice Encoding Methods (Springware)
Digitizing Method
Sampling Rate
(kHz)
Resolution (Bits) Bit Rate (Kbps) File Format
OKI ADPCM 6 4 24 VOX, WAVE
OKI ADPCM 8 4 32 VOX, WAVE
G.711 PCM
A-law and mu-law
6 8 48 VOX, WAVE
G.711 PCM
A-law and mu-law
8 8 64 VOX, WAVE
Linear PCM
8 8 64 VOX, WAVE
Linear PCM 11 8 88 VOX, WAVE
Linear PCM 11 16 176 VOX, WAVE
GSM 6.10 full rate
(Microsoft format)
8 (value ignored) 13 WAVE
GSM 6.10 full rate
(TIPHON format)
8 (value ignored) 13 WAVE
G.726 bit exact 8 4 32 VOX