Yealink SIP-T2 SERIES Administrator's Manual page 746

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Details of Configuration Parameters:
network.qos.rtptos
Description:
Configures the DSCP (Differentiated Services Code Point) for voice packets.
The default DSCP value for RTP packets is 46 (Expedited Forwarding).
Note: If you change this parameter, the IP phone will reboot to make the change
take effect. It is not applicable to SIP VP-T49G IP phones.
Web User Interface:
Network->Advanced->Voice QoS (0~63)
Phone User Interface:
None
network.qos.signaltos
Description:
Configures the DSCP (Differentiated Services Code Point) for SIP packets.
The default DSCP value for SIP packets is 26 (Assured Forwarding).
Note: If you change this parameter, the IP phone will reboot to make the change
take effect.
Web User Interface:
Network->Advanced->SIP QoS (0~63)
Phone User Interface:
None
network.qos.audiotos
Description:
Configures the DSCP (Differentiated Services Code Point) for voice packets.
The default DSCP value for RTP 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->Audio QoS (0~63)
Phone User Interface:
None
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Parameters Permitted Values
Integer from 0 to 63
Integer from 0 to 63
Integer from 0 to 63
Default
46
26
46