Grandstream Networks GVC3210 Administration Manual page 45

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Codec
Negotiation
Priority
Silence
Suppression
Voice Frames Per
TX
G.722.1 Rate
G.722.1 Payload
Type
G.722.1C Rate
G.722.1C Payload
Type
Opus Payload
Type
iLBC frame size
Use First
Matching
Vocoder in 200OK
SDP
Enable Audio
RED with FEC
Audio FEC
Payload Type
Audio RED
Payload Type
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It is used to configure the codec negotiation sequence when the GVC3210 is acted
as a callee. If set to "Caller", the device will negotiate codec by SDP codec sequence
from the received SIP INVITE message. If set to "Callee", the device will 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
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".
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 in payload during the call. e.g.: if set to 2 and the first codec is G.729 or
G.711 (PCMU/PCMA), 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".
It is used to select encoding rate for G.722.1 codec. It supports 24kbps or 32kbps.
The default setting is "24kbps encoding rate".
It is used to configure payload type for G.722.1 codec. The valid range is 100-126.
The default setting is "104".
It is used to select encoding rate for G.722.1C codec. It supports 24kbps, 32kbps or
48kbps. The default setting is "24kbps encoding rate".
It is used to configure payload type for G.722.1C codec. The valid range is 100-126.
The default setting is "103".
It is used to configure payload type for Opus codec. The valid range is 96-126. The
default setting is "123".
It is used to select iLBC Packet frame size. It supports 20ms or 30ms. The default
setting is 30ms.
If set to "Yes", the device will use the first matching vocoder in the sent 200OK SDP
as the codec. The default setting is "No".
If set to "Yes", FEC (Forward Error Correction) will be enabled for audio calls. The
default setting is "No".
It is used to configure payload type for Audio FEC codec. The valid range is 96-127.
The default setting is "121".
It is used to configure payload type for Audio RED codec. The valid range is 96-127.
The default setting is "124".
GVC3210 Administration Guide
Version 1.0.1.21
P a g e | 45