Specifications

Administrator’s Guide for CP860 IP conference phones
264
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.
Procedure
DSCPs for voice packets and SIP packets can be configured using the configuration files
or locally.
Configuration File
y000000000037.cfg
Configure the DSCPs for voice
packets and SIP packets.
Parameters:
network.qos.rtptos
network.qos.signaltos
Local
Web User Interface
Configure the DSCPs for voice
packets and SIP packets.
Navigate to:
http://<phoneIPAddress>/servl
et?p=network-adv&q=load
Details of Configuration Parameters:
Parameters
Permitted Values
Default
network.qos.rtptos
Integer from 0 to 63
46
Description：
Configures the DSCP 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.
Web User Interface:
Network->Advanced->Voice QoS (0~63)
Phone User Interface: