346 Matrix PRASAR UCS System Manual
• If you do not want to select any Vocoder, you can select the option 'None' in the Template. However, if
all Vocoder Preferences from 1 to 7 are set to 'None', incoming and outgoing calls will be blocked.
• G.722 is not applicable for when RTP Mode is set as Transcoding in “Configuring VoIP Parameters”.
• G.723 Bit Rate (kbps): You can select the Bit Rate for G.723 codec as 5.3 kbps or 6.3 kbps. 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. The default G.723 Bit Rate is
6.3kpbs.
• Silence Suppression for Vocoders: If you select this check box, the system suppresses the 'Silence'
packets, allowing only the Voice packets to pass through. PRASAR UCS supports Silence Suppression for
all Vocoders except GSM FR. By default, this option is disabled.
Silence Suppression must be disabled if you have selected 'Pass Through' as the “Fax Type”.
• Send Silence Suppression Attribute: By default this is flag is enabled, that is, the system will include the
"silencesupp" media attribute in the SDP body.
If you do not want the system to include the "silencesupp" media attribute in the SDP body, clear the flag.
Silence Suppression Attribute is not dependent on the Silence Suppression option set.
• SIP Gain Settings Template: You can increase or decrease the level of Incoming Speech (Receive Gain)
and Outgoing Speech (Transmit Gain) on the SIP Trunks/Extensions by changing the Rx Gain and Tx Gain
to the desired level. Different levels can be set for each port type in the SIP Gain Settings Template. By
default, SIP Gain Template 1 is assigned to all the SIP Hardware Templates. If you want to assign a
different Template, you must customize the SIP Gain Settings Template first and then assign the number of
the SIP Gain Settings Template in this Template. To customize the SIP Gain Settings, see “Gain Settings”.
• DTMF Type: This parameter will determine how the DTMF digits will be sent over the IP Network, when a
DTMF digit is pressed. The PRASAR UCS supports three DTMF options: i) RTP (RFC 2833), ii) SIP Info,
and iii) In-Band. You may select the appropriate option. By default, RTP (RFC 2833) is selected.
• RFC2833 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. By default, 101 is selected.
• Call Hold Method: You can select RFC 2543 or RFC 3264, as per your requirement.
If you select RFC 3264, the following information will be sent in the SDP:
• Connection Information: IP Address as used in Contact
• Media attribute (a) : sendonly
If you select RFC 2543, the following information will be sent in the SDP:
• Connection Information: 0.0.0.0
• Media attribute (a) : sendonly
By default RFC 3264 is selected.
• Click Submit.
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