Matrix NAVAN CNX200, System Manual

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Matrix NAVAN CNX200 System Manual 359
11.
Select Vocoders
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in the order of preference from the drop down box. Depending on the RTP Mode that
you select in the VoIP Port parameters page (see “VoIP Port” within the PBX Settings tab), the availability
of Vocoders will change.
Following is the default list of Vocoders supported by NAVAN in the order of preference, i.e. 1st to 5th,
when the selected RTP Mode (in the VoIP Port parameters page) is Transcoding:
• G.723
• G.729 AB
• GSM FR
• G.711

Law
• G.711 A - Law
However, when the selected RTP Mode (in the VoIP Port parameters page) is either RTP Relay or Direct
RTP, three more Vocoders can be selected from the list. These are as follows:
• iLBC-30ms
• iLBC-20ms
• G.722
If you do not want to select any Vocoder, you can select the option 'None'. However, if all Vocoder
Preferences from 1 to 5 are set to 'None', incoming and outgoing calls will be blocked.
12.
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.
13.
To suppress ‘Silence’ packets and allow only Voice packets through, select the check box Silence
Suppression . Default: Disabled.
• NAVAN supports Silence Suppression for all Vocoders except GSM FR.
• Silence Suppression must be disabled if you have selected 'Pass Through' as the “Fax Type”.
14.
Select the appropriate DTMF Option from the three DTMF types supported by NAVAN: RTP (RFC 2833)
or SIP Info, or InBand. Default: RTP (RFC2833).
The DTMF type determines how the DTMF digits will be sent over the IP Network, when a DTMF digit is
pressed.
15.
RFC 2833 Payload Type: If you have selected RTP (RFC 2833) as the DTMF Type, you must configure
the value of RFC2833 Payload Type. The RTP packets will be tagged as DTMF as per the set value. The
value of RFC2833 Payload Type can be set from 96 to 127.
16.
Gain Settings: To avoid noise or echo during speech on SIP Extensions, you must set the speech volume
levels (Tx and Rx Gain) on the SIP Extension.
• SIP - System (Tx-Gain and Rx-Gain) : Configure the Gain Settings that you want the system to apply
on the SIP Extension with respect to the system (for example, Call Conference). These will not be
applicable for any other port type. Valid Range for Tx Gain: -31dB to +31dB and Rx Gain -31dB to
+31dB. Default: 0dB.
46. Vocoders are the various voice codecs used to compress the data in RTP packets for optimum use of bandwidth and better voice
quality.