Grandstream Networks GXV3240 Administration Manual page 54

H.264 Payload Type
SRTP Mode
SRTP Encryption Bit
Silence Suppression
Voice Frames Per TX
Jitter Buffer Maximum (ms)
Firmware Version 1.0.3.6
The default setting is "Media Level".
Note:
Please do not modify this setting without knowing the session format
supported by the server. Otherwise, it might cause video decoding
failure.
It is used to configure the H.264 codec message payload type format.
The default setting is 99. The valid range is from 96 to 127.
It is used to set if the phone system will enable the SRTP (Secured
RTP) mode. It can be selected from dropdown list:

Disable

Enabled but not forced

Enabled and forced
SRTP uses encryption and authentication to minimize the risk of
denial of service. (DoS). If the server allows to use both RTP and
SRTP, it should be configured as "Enabled but not forced". The
default setting is "Disable".
It is to configure all the AES (Advanced Encryption Standard) key size
within SRTP. It can be selected from dropdown list:

AES128&256 bit

AES 128 bit

AES 256 bit
If it is set to "AES 128&256 bit", the phone system will provides both
AES 128 and 256 cipher suite for SRTP. If set to "AES 128 bit", it only
provides 128 bit cipher suite; if set to "AES 256 bit", it only provides
256 bit cipher suite. The default setting is "AES128&256 bit".
It is used to set 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".
It is used to set 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.
It is used to define the amount of delay to eliminate jitter caused by
GXV3240 Administration Guide Page 52 of 105