Grandstream Networks GXV34 0 Series - Page 40

H.264 Payload Type
Species the H.264 codec message payload type format. The default setting is 99.
The valid range is from 96 to 127.
Presentation Settings
Packet Retransmission
If set to "NACK", the signaling will carry NACK info. After negotiation, the media will use NACK to
retransmit lost packets. If set to "NACK+RTX (SSRC-GROUP)", the signaling will carry both NACK
and RTX info. After negotiation, the media will use NACK+RTX (SSRC-GROUP) to achieve packet
loss retransmission. If set to "Disabled", packet loss retransmission cannot be used.
The Default setting is "NACK+RTX (SSRC-GROUP)".
Enable BFCP
If set to “Yes”, the device will be able to receive the presentation stream in video calls and video
meetings.
Initial INVITE with Media
Info
Initial INVITE SDP contains presentation media.
Presentation H.264
Image Size
Selects the H.264 image size. Users can select 1080P or 720P.
Presentation H.264
Prole Type
Select the Presentation H.264 Prole Type from “Baseline Prole”, “Main Prole”, “High Prole” and
“BP&MP&HP”. The default setting is “BP&MP&HP”.
The lower the prole type is, the easier the packet can be decoded. However, higher level has high
compression ratio. For device with low CPU, select “Baseline Prole” to play record; “Baseline
Prole” is more likely to be used in a video conference that has high demanding for the video
quality. Select among the three types to achieve best video effect.
Presentation Video Bit
Rate
Congures the bit rate of the video. 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. Video Bit Rate
can be set to integer value from 512kbps to 2048kbps.
Presentation Video
Frame Rate
Congure the video frame rate for presentation.
BFCP Transport Protocol
Denes the transport protocol used for BFCP. Users can choose from Auto/UDP/TCP. The default
setting is “UDP” rst, if not supported, then choose “TCP”. If choose “Auto”, automatically switches
between “UDP” and “TCP”.
RTP Settings
SRTP Mode
Sets 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 congured as “Enabled but not forced”. The
default setting is “Disable”.
SRTP Key Length Congures 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