Grandstream Networks GSC3516 User Manual page 27

Force INVITE
Accounts/Codec Settings
Preferred Vocoder
Codec Negotiation Priority
Use First Matching
Vocoder in 200OK SDP
iLBC Frame Size
G.726-32 Packing Mode
G.726-32 Dynamic
Payload Type
Opus Payload Type
Send DTMF
DTMF Payload Type
Enable Audio RED with
FEC
Audio FEC Payload Type
Audio RED Payload Type
Silence Suppression
Voice Frames per TX
Sets the SIP message type for refresh the session. If it is set to "Yes", the Session Timer will be
refreshed by using the SIP INVITE message. Otherwise, the device will use the SIP UPDATE or
SIP OPTIONS message. Default is "No".
Accounts – SIP Settings page
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.
Selects "ITU" or "IETF" for G.726-32 packing mode.
Specifies the G726-32 payload type, and the valid range is 96 to 127. The default setting is "127".
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 digits.
● in-audio
● via RTP (RFC2833)
● via SIP INFO
The default settings: via RTP(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.
If set to "Yes", FEC will be enabled for audio call. The default setting is "No".
Configures audio FEC payload type. The valid range is from 96 to 127. The default value is 121.
Configures audio RED payload type. The valid range is from 96 to 127. The default value is 124.
If 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. For codec G.723 and G.729 only. Default is not enabled
Configures the number of voice frames transmitted per packet. When configuring this, 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. For end users, it is recommended to
use the default setting, as incorrect settings may influence the audio quality.
The default setting is 2.
Audio