Yealink SIP-T4X, Administration Manual

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Configuring Advanced Features
177
high-quality QoS only if the voice and the SIP packets are given priority over other kinds
of network traffic. IP phones support the DiffServ model of QoS.
Voice QoS
In order to make VoIP transmissions intelligible to receivers, voice packets should not be
dropped, excessively delayed, made to suffer varying delay. DiffServ model can
guarantee high-quality voice transmission when the voice packets are configured to a
higher DSCP value.
SIP QoS
SIP protocol is used for creating, modifying and terminating two-party or multi-party
sessions. To ensure good voice quality, SIP packets emanated from IP phones should be
configured with a high transmission priority.
DSCPs for voice and SIP packets can be specified respectively.
Note
Procedure
DSCPs for voice packets and SIP packets can be configured using the configuration files
or locally.
Configuration File <y0000000000xx>.cfg
Configure the DSCPs for voice
packets and SIP packets.
For more information, refer to
QoS on page 348 .
Local Web User Interface
Configure the DSCPs for voice
packets and SIP packets.
Navigate to:
http://<phoneIPAddress>/servl
et?p=network-adv&q=load
To configure DSCPs for voice packets and SIP packets via web user interface:
1. Click on Network->Advanced.
2. Enter the desired value in the Voice QoS (0~63) field.
The DSCP value of voice traffic in the received LLDP packet will override the manual
configuration.