Use First Matching Vocoder in
200OK SDP
When set to “Yes”, the device will use the first matching vocoder in the received 200OK SDP as the
codec. The default setting is “No”.
iLBC Frame Size Selects iLBC packet frame size. Users can choose from 20ms and 30ms. The default setting is “30ms”.
iLBC Payload Type
Specifies iLBC payload type. Valid range is 96 to 127. Cannot be the same as Opus or DTMF payload
type. Valid range is 96 to 127. The default setting is “97”.
G.726-32 Packing Mode
Selects “ITU” or “IETF” for G726-32 packing mode.
The default setting is “ITU”.
G.726-32 Dynamic Payload
Type
Specifies G.726-32 payload type. Valid range is 96 to 127. Default is 127.
Opus Payload Type
Specifies Opus payload type. Valid range is 96 to 127. It cannot be the same as iLBC or DTMF
Payload Type. Default value is 123.
Send DTMF
Specifies the mechanism to transmit DTMF digits. There are 3 supported modes:
1. In audio: DTMF is combined in the audio signal (not very reliable with low-bit-rate codecs).
2. RFC2833 sends DTMF with RTP packet. Users can check the RTP packet to see the DTMFs sent
as well as the number pressed.
3. SIP INFO uses SIP INFO to carry DTMF.
Default setting is “RFC2833”.
DTMF Payload Type
Configures the payload type for DTMF using RFC2833. Cannot be the same as iLBC or OPUS
payload type.
Enable Audio RED with FEC
If set to “Yes”, FEC will be enabled for audio call.
If set to “Yes”, FEC will be enabled for audio call.
Silence Suppression
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 setting is “No”.
Jitter Buffer Type
Selects either Fixed or Adaptive for jitter buffer type, based on network conditions. The default setting
is “Adaptive”.
Jitter Buffer Length
Selects jitter buffer length from 100ms to 800ms, based on network conditions. The default setting is
“300ms”.
Voice Frames Per TX
Configures the number of voice frames transmitted per packet. It is recommended that the IS limit
value of Ethernet packet is 1500 bytes or 120 kbps. 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 in the codec table or negotiate the payload type during the actual call. For example, if set
to 2 and the first code is G.729, G.711 or G.726, the “ptime” value in the SDP datagram of the
INVITE request is 20 ms. If the “Voice Frame/TX” setting exceeds the maximum allowed value, the
phone will use and save the maximum allowed value for the selected first codec. It is recommended to
use the default setting provided, and incorrect setting may affect voice quality.
The default setting is 2.
G.723 Rate Selects encoding rate for G723 codec.
RTP Settings
SRTP Mode Enable SRTP mode based on your selection from the drop-down menu.
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