Codec Settings - Grandstream Networks GSC35 Series User Manual

Codec Settings

Preferred Vocoder
Preferred Vocoder
Codec Negotiation
Priority
Use First Matching
Vocoder in 200OK SDP
iLBC Frame Size
G726-32 ITU Payload
Type
G726-32 Dynamic
Payload Type
Opus Payload Type
DTMF
DTMF Payload Type
Jitter Buffer Type
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.
Configures the device to use which codec sequence to negotiate as the
callee. When set to "Caller", the device negotiates by SDP codec sequence
from received SIP Invite; When set to "Callee", the device negotiates by
audio codec sequence on the device. The default setting is "Callee".
Configures the device to use the first matching codec in the 200OK
message. The default value is 0.
Sets the iLBC (Internet Low Bitrate Codec) frame size if ILBC is used.
Users can select it from 20ms or 30ms. The default setting is 30ms.
Configures G726-32 payload type for ITU packing mode. Payload 2 is static
and payload dynamic is dynamic. The default setting is "2".
Specifies the G726-32 payload type, and the valid range is 96 to 127. The
default setting is "126".
Defines the desired value (96-127) for the payload type of the Opus codec.
The default value is 123.
Specifies the mechanism to transmit DTMF (Dual Tone Multi-Frequency)
signals.
There are 3 supported modes: in audio, RFC2833, or SIP INFO.
• In audio, which means DTMF is combined in the audio signal (not very
reliable with low-bit-rate codecs);
• RFC2833, which means to 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, which uses SIP INFO to carry DTMF. The defect of this mode
is that it's easily to cause desynchronized of DTMF and media packet if the
SIP and RTP messages are required to transmitted respectively.
The default setting is "RFC2833".
Configures the RTP payload type that indicates the transmitted packet
contains DTMF digits. Valid range is from 96 to 127. Default value is 101.
Selects either Fixed or Adaptive based on network conditions.
GSC35XX Series User Manual
Version 1.0.0.15
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