iPECS UCP
Feature Description and Operation Manual Issue 1.3
163
2.50 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 UCP 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, VOIM8 or VOIM24
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