228 Matrix ETERNITY NE System Manual
VoIP
1. Click VoIP to expand parameters.
Vocoders
2. Select Vocoders
66
in the order of preference from the drop down box.
The Vocoders supported by ETERNITY in the order of preference, i.e. 1st to 7th, by default are:
• G.723
• G.729 AB
•GSM FR
• iLBC - 30 ms
• iLBC - 20 ms
•G.711 Law
• G.711 A - Law
If you do not want to select any Vocoder, you can select the option 'None'. However, if all Vocoder
Preferences from 1 to 7 are set to 'None', incoming and outgoing calls will be blocked.
3. If you selected G.723 codec as a Preferred Vocoder, select G.723 Bit Rate as: Bit Rate: 5.3 Kbps or 6.3
Kbps. Default: 6.3kpbs.
When G.723 is negotiated, the selected Bit Rate will be applied only when sending the RTP packets.
When receiving RTP packets from the remote end, both Bit Rates of G.723 will be accepted.
4. Select the check box Silence Suppression to suppress the 'Silence' packets, and to allow only the Voice
packets through. ETERNITY supports Silence Suppression for all Vocoders except GSM FR.
5. Select the DTMF Option.
The DTMF option you select will determine how the DTMF digits will be sent over the IP Network, when a
DTMF digit is pressed.
66. Vocoders are the various voice codecs used to compress the data in RTP packets for optimum use of bandwidth and for ensuring
voice quality. You can set 7 Vocoder options in the order of preference.
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