This configuration will be included with the same preference order in the SIP SDP message.
Codec Negotiation
Priority
Configures the phone to use which codec sequence to negotiate as the callee. When set to “Caller”, the
phone negotiates by SDP codec sequence from received SIP Invite; When set to “Callee”, the phone
negotiates by audio codec sequence on the phone. The default setting is “Callee”.
Use First Matching
Vocoder in 200OK SDP
Configures the phone to use the first matching codec in the 200OK message.
The default value is 0.
ILBC Frame Size
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.
G726-32 ITU Payload
Configures G726-32 payload type for ITU packing mode. Payload 2 is static and payload dynamic is
dynamic.
The default setting is “2”.
G726-32 Dynamic PT Specifies the G726-32 payload type, and the valid range is 96 to 126. The default setting is “126”.
Opus Payload Type
Defines the desired value (96-126) for the payload type of the Opus codec.
The default value is 123.
DTMF
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”.
DTMF Payload Type
Configures the RTP payload type that indicates the transmitted packet contains DTMF digits. Valid range is
from 96 to 126.
Default value is 101.
Enable Audio RED with
FEC
If set to “Yes”, FEC will be enabled for audio call.
The default setting is “No”.
Audio FEC Payload Type
Configures audio FEC payload type. The valid range is from 96 to 126.
The default value is 121.
Audio RED Payload Type
Configures audio RED payload type. The valid range is from 96 to 126.
The default value is 124.
Silence Suppression
Enables 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
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.
Preferred Video Codec
To Next Page
Loading...
