Setting Up Your System
119
be given different forwarding assurances.
Default PHB
-- specifies that a packet marked with a DSCP value of “000000” gets the
traditional best effort service from a DS-compliant node.
VoIP is extremely bandwidth and delay-sensitive. QoS is a major issue in VoIP implementations,
regarding how to guarantee that packet traffic not be delayed or dropped due to interference
from other lower priority traffic. VoIP can guarantee 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, or 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
QoS can be configured using the following methods.
Central Provisioning
(Configuration File)
<y0000000000xx>.cfg
Configure the DSCPs for voice
packets and SIP packets.
Parameters:
static.network.qos.audiotos
static.network.qos.signaltos
Web User Interface
Configure the DSCPs for voice
packets and SIP packets.
Navigate to
:
http://<phoneIPAddress>/servlet?p
=network-adv&q=load
Details of Configuration Parameters:
For voice and SIP packets, the IP phone obtains DSCP info from the network policy if LLDP
feature is enabled, which takes precedence over manual settings. For more information on LLDP,
refer to
on page
Summary of Contents for SIP-T54S
Page 1: ...63...
Page 51: ...Getting Started 25 For SIP T46G S Desk Mount Method Wall Mount Method Optional...
Page 53: ...Getting Started 27 For SIP T42S T41S Desk Mount Method Wall Mount Method Optional...
Page 55: ...Getting Started 29 For SIP T23P T23G Desk Mount Method Wall Mount Method Optional...
Page 70: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series CP860 CP920 IP Phones 44...
Page 194: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series CP860 CP920 IP Phones 168...
