Settings/Sip/Codec - Grandstream Networks GVC3200 Administration Manual

Settings/SIP/Codec

Parameters Descriptions
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.


DTMF

The default setting is "RFC2833".
DTMF Payload
It is used to configure the RTP payload type that indicates the transmitted packet
Type contains DTMF digits. The valid range is from 96 to 127. The default setting is "101".
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
Preferred
order from top to bottom. This configuration will be included with the same preference
Vocoder
order in the SIP SDP message. The codec option includes "PCMU", "PCMA", "Opus",
"G.722", and "G.722.1".
It is used to configure the codec negotiation sequence when the GVC3200/GVC3202
Codec
is acted as a callee. If set to "Caller", the device will negotiate codec by SDP codec
Negotiation sequence from the received SIP INVITE message. If set to "Callee", the device will
Priority
negotiate codec according to the codec priority configuration on the device itself. The
default setting is "Callee".
It is used to set the silence suppression/VAD feature. If it is set to "Yes", when silence
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
Suppression
setting is "No".
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.
GVC3200/3202 Administration Guide
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