Grandstream Networks GXP2120 User Manual User Manual page 49

Accept Incoming SIP
from Proxy Only
Authenticate Incoming
INVITE
Account x -> Audio Settings
Send DTMF
DTMF Payload Type
Preferred Vocoder
Use First Matching
Vocoder in 200OK SDP
SRTP Mode
Symmetric RTP
Silence Suppression
Voice Frames Per TX
G723 Rate
G.726-32 Packing Mode
iLBC Frame Size
iLBC Payload Type
Jitter Buffer Type
FIRMWARE VERSION 1.0.5.24
When set to "Yes", the SIP address of the Request URL in the incoming SIP
message will be checked. If it doesn't match the SIP server address of the
account, the call will be rejected. The default setting is "No".
If set to "Yes", the phone will challenge the incoming INVITE for authentication
with SIP 401 Unauthorized response. The default setting is "No".
Specifies the mechanism to transmit DTMF digits. There are 3 supported
modes: in audio which means DTMF is combined in the audio signal (not very
reliable with low-bit-rate codecs), via RTP (RFC2833), or via SIP INFO.
Configures the payload type for DTMF using RFC2833. The default value is
101.
7 different vocoder types are supported on the phone, including G.711 U-law
(PCMU), G.711 A-law (PCMA), G.723.1, G.729A/B, G.722 (wide band), iLBC
and G72-32. Users can configure vocoders in a preference list that is included
with the same preference order in SDP message.
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".
Enables the SRTP mode based on your selection. The default setting is
"Disabled".
Defines whether symmetric RTP is supported or not. The default setting is
"No".
Controls the silence suppression/VAD feature of the audio codec G.723 and
G.729. 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.
If set to "No", this feature is disabled. The default setting is "No".
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.
Selects encoding rate for G723 codec. The default value is 5.3kbps.
Selects "ITU" or "IETF" for G726-32 packing mode.
Selects iLBC packet frame size. The default value is 30ms.
Specifies iLBC Payload type. The default value is 97. The valid range is
between 96 and 127.
Selects either Fixed or Adaptive based on network conditions. The default
GXP2120/GXP2110/GXP2100/GXP14xx USER MANUAL Page 49 of 77