Grandstream Networks GXV3275 Administration Manual page 50

G726-32 Dynamic PT
Opus Payload Type
Enable RFC5168 Support
Packetization Mode
H.264 Image Size
Use H.264 Constrained
Profiles
H.264 Profile Type
Video Bit Rate
Specifies the G726-32 payload type, and the valid range is 96 to 127. The default
setting is "126".
Defines the desired value (96-127) for the payload type of the Opus codec. The default
value is 123.
Enables/disables RFC5168 mechanism for video calls. RFC5168 allows SIP party to
request the sender to refresh its video frame in H.264, or refresh the full picture in
VP8.The default setting is "No".
Configures the packetization mode (0 or 1) for the video packets during the video calls.
The default setting is "1".
Sets the H.264 image size. It can be selected from the dropdown list.

720P

4CIF

VGA

CIF

QVGA

QCIF
The default setting is 720P. Note: For some network environment, the default setting
"720P" might be too high that causes no video or video quality issue during video call.
In this case, please change "H.264 Image Size" to "VGA" or "CIF" and change "Video
Bit Rate" to "384kbps" or lower.
Configures that whether to set H.264 constrained profiles.
The default setting is "No".
Selects the H.264 profile type from the dropdown list.

Baseline Profile (Default Setting)

Main Profile

High Profile

BP/MP/HP
Note: Lower levels are easier to decode, but higher levels offer better compression.
Usually, for the best compression quality, choose "High Profile"; for playback on low-
CPU machines or mobile devices, choose "Baseline Profile". If "BP/MP/HP" is selected,
all three profiles "Baseline Profile" "Main Profile" and "High Profile" will be used for
negotiation during video decoding to achieve the best result. This is usually used in
video conference when there is higher requirement on the video.
Configures the bit rate for video call. It can be selected from the dropdown list. The
default setting is 2048 kbps. The valid range is from 32 – 2048 kbps.
Note: The video bit rate can be adjusted based on the network environment. Increasing
the video bit rate may improve video quality if the bandwidth is permitted. If the
bandwidth is not permitted, the video quality will decrease due to packet loss. For some
network environment, the default setting "720P" might be too high that causes no video
or video quality issue during video call. In this case, please change "H.264 Image Size"
to "VGA" or "CIF" and change "Video Bit Rate" to "384kbps" or lower.
GXV3275 Administration Guide
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