iPECS-LIK
Feature Description & Operation Manual
Issue 6.0d1
124
2.49 IP TRANS-CODING
Description
The system employs either IEEE g.711, g.729 or g.723 codec to digitize and compress voice
signals for RTP packets between iPECS devices. iPECS terminals and gateway Modules
incorporate DSP functions to support codec conversion Available VOIMs include DSP circuitry
used to support trans-coding (converting) codecs for incoming VoIP calls to devices, such as
the MFIM VoIP channels, the VSF channels and the Feature Server, which have no built-in
codec. The VOIMs will trans-code the incoming voice codec (g.711, g.723, g.729) to the
system codec and reverse the process for the outgoing packets. When the external VoIP
connection can only support g.729 and the system codec is g.723, the DSP must implement a
complex trans-coding operation, which requires 2 DSP channels. In all other cases, trans-
coding only requires a single channel per call.
Operation
System
System flow with trans coding:
Conditions
1. The system codec toward the VOIM can be changed anytime within an IP call.
2. The VOIM DSP can generate and detect in-band DTMF and Call Progress tones in
support of DISA functionality.
3. For complex trans-coding (g.723/g.729), the VOIM DSP will require 2 channels.
4. If there are no available channels when trans-coding is required, the VOIM gateway
will release call control.
Programming
Related Features
System Networking
Remote Device Zone Management
Содержание iPECS-LIK
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