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Summit & Summit 800
Feature Description and Operation Manual
Issue 1.2
172
2.51
IP TRANS-CODING
Description
The system employs the IEEE g.711, g.729, g.722 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 VoIP channels include DSP
circuitry used to support trans-coding (converting) codecs for incoming VoIP calls to devices such
as the VoIP channels and the VSF channels, which have no built-in codec. The VoIP DSPs will
trans-code the incoming voice codec to the system codec and reverse the process for the
outgoing packets. When the DSP must implement a complex trans-coding operation (translation
between g.729, g.723 or g.722), two (2) DSP channels are required. In all other cases, trans-
coding only requires a single channel per call.
Operation
Conditions
1. The system codec toward the VoIP channel can be changed anytime during an IP call.
2. The VoIP 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), two (2)VoIP DSP channels are required.
4. If there are no available channels when trans-coding is required, the VoIP gateway will
release call control.
Programming
Related Features
System Networking
Remote Devices
Hardware
Built-in VoIP channels, VOIB