Yealink SIP-T2 SERIES Administrator's Manual page 747

Parameters
network.qos.videotos
Description:
Configures the DSCP (Differentiated Services Code Point) for video packets.
The default DSCP value for H264 packets is 46 (Expedited Forwarding).
Note: If you change this parameter, the IP phone will reboot to make the change
take effect. It is only applicable to SIP VP-T49G IP phones.
Web User Interface:
Network->Advanced->Video QoS (0~63)
Phone User Interface:
None
To configure DSCPs for voice packets and SIP packets via web user interface (take
SIP-T23G IP phones for example):
1. Click on Network->Advanced.
2. Enter the desired value in the Voice QoS (0~63) field.
3. Enter the desired value in the SIP QoS (0~63) field.
4. Click Confirm to accept the change.
A dialog box pops up to prompt that settings will take effect after a reboot.
Configuring Advanced Features
Permitted Values
Integer from 0 to 63
Default
46
725