Codec Settings - Grandstream Networks GHP6 Series Administration Manual

Force INVITE

Codec Settings

Preferred Vocoder
(Choice 1 – 8)
Codec Negotiation Priority
Use First Matching Vocoder in
200OK SDP
iLBC Frame Size
iLBC Payload Type
G.726-32 Packing Mode
G.726-32 Dynamic Payload
Type
Opus Payload Type
Send DTMF
DTMF Payload Type
Enable Audio RED with FEC
Select "Yes" to force using the INVITE method to refresh the session timer.
The default setting is "No".
Audio
Multiple vocoder types are supported on the phone, the vocoders in the list is a higher
preference. Users can configure vocoders in a preference list that is included with the same
preference order in SDP message.
● Opus
● G722
● PCMU
● PCMA
● G.723.1
● G.729.1
● iLBC
● G.726-32
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".
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".
Selects iLBC packet frame size. Users can choose from 20ms and 30ms. The default
setting is "30ms".
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".
Selects "ITU" or "IETF" for G726-32 packing mode.
The default setting is "ITU".
Specifies G.726-32 payload type. Valid range is 96 to 127. Default is 127.
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.
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".
Configures the payload type for DTMF using RFC2833. Cannot be the same as iLBC or
OPUS payload type.
If set to "Yes", FEC will be enabled for audio call.
If set to "Yes", FEC will be enabled for audio call.