Grandstream GVC3200 Administration Guide - Manual (Page 36)

Firmware Version 1.0.1.5 GVC3200 Administration Guide Page 35 of 61
Check Domain
Certificates It is used to set if the GVC3200 system will check the domain certificates if TLS/TCP
is used for SIP Transport. The default setting is "No".
Domain Certificate
It is used to configure the certificate for Authentication, and the option "Check
Domain certificates" needs to be set to "Yes".
SETTINGS/SIP/CODEC
Parameters Descriptions
DTMF
It is used to set the parameter to specify the mechanism to transmit DTMF (Dual
Tone Multi-Frequency) signals. There are 3 supported modes: in audio, RFC2833,
or SIP INFO.
• In audio
DTMF is combined in the audio signal (not very reliable with low-bit-rate codecs)
• RFC2833
Specify DTMF with RTP packet. Users could know the packet is DTMF in the RTP
header as well as the type of DTMF.
• SIP INFO
Use SIP INFO to carry DTMF. The disadvantage of this mode is that it's easy to
cause desynchronized of DTMF and media packet if the SIP and RTP messages
are required to transmitted respectively.
The default setting is "RFC2833".
DTMF Payload
Type It is used to configure the RTP payload type that indicates the transmitted packet
contains DTMF digits. The valid range is from 96 to 127. The default setting is “101”.
Preferred Vocoder
It lists the available and enabled audio codecs for this account. Users can enable
the specific audio codecs by moving them to the Selected box and set them with a
priority order from top to bottom. This configuration will be included with the same
preference order in the SIP SDP message. The codec option includes “PCMU”,
“PCMA”, “G.722”, and “G.722.1”.
Silence
Suppression
It is used to set the silence suppression/VAD feature. If it is set to "Yes", when
silence is detected, a small quantity of VAD packets (instead of audio packets) will
be sent during the period of no talking. If set to "No", this feature is disabled. The
default setting is "No".
Voice Frames Per
TX
It should be noted that the "ptime" value for the SDP will change with different
configurations here. This value is related to the codec used and the actual frames
transmitted during the in payload call. e.g.: if set to 2 and the first codec is
G.729,G.711 or G.726, the "ptime" value is 20ms for the SDP.If the TX exceeds the
maximum allowable value, the device will use and save the maximum allowed value
according to what the first codec is. For end users, it is recommended to use the
default setting, as incorrect settings may influence the audio quality. The default
setting is “2”.
G.722.1 Rate
It is used to select encoding rate for G.722.1 codec. It supports 24kbps or 32kbps.
The default setting is “24kbps encoding rate”.