3. PBX Integration Overview
The Dialogic® PBX Integration Board combines the voice and fax features
available in the Dialogic® D/4x product line with the ability to access enhanced
PBX features on several different PBXs. The voice features include:
play and record voice messages
dial and recognize DTMF digits
detect and answer incoming calls
call progress analysis
send and receive faxes
The PBX-specific features include:
retrieve Called/Calling number ID
retrieve LCD/LED prompts and indicators
read displays
accessing PBX features using dial strings
disconnect supervision

3.1. Voice Features Supported

The Dialogic® PBX Integration Board uses a dual-processor architecture
comprising a DSP (Digital Signal Processor) and a general purpose
microprocessor to handle voice processing functions. This dual processor
approach off loads many low-level decision making tasks from the host computer.
When a PBX integration system is initialized, firmware is downloaded from the
host PC to the firmware RAM and DSP memory on the Dialogic® PBX
Integration Board. This downloadable firmware gives the board its intelligence
and enables feature enhancement and upgrades. Based on this, the PBX
Integration Board can perform the following operations on incoming calls:
automatically control the volume of the incoming audio signal
record and compress the incoming audio voice signal. Sampling rates and
coding methods are selectable on a channel by channel basis.
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