Yealink SIP-T48G Administrator's Guide

Configuring Advanced Features
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5. Enter the port of the central report collector in the VQ RTCP-XR Collector port field.
6. Click Confirm to accept the change.
Quality of Service (QoS) is the ability to provide different priorities for different packets
in the network, allowing the transport of traffic with special requirements. QoS
guarantees are important for applications that require fixed bit rate and are delay
sensitive when the network capacity is insufficient. There are four major QoS factors to
be considered when configuring a modern QoS implementation: bandwidth, delay,
jitter and loss.
QoS provides better network service through the following features:
 Supporting dedicated bandwidth
 Improving loss characteristics
 Avoiding and managing network congestion
 Shaping network traffic
 Setting traffic priorities across the network
The Best-Effort service is the default QoS model in IP networks. It provides no
guarantees for data delivering, which means delay, jitter, packet loss and bandwidth
allocation are unpredictable. Differentiated Services (DiffServ or DS) is the most widely
used QoS model. It provides a simple and scalable mechanism for classifying and
managing network traffic and providing QoS on modern IP networks. Differentiated
Services Code Point (DSCP) is used to define DiffServ classes and stored in the first six
bits of the ToS (Type of Service) field. Each router on the network can provide QoS

Yealink SIP-T48G Specifications

General

Expansion module support	Yes
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Volume control	-
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
AC adapter input voltage	100 - 240 V
Number of handles included	1 pc(s)

Weight and Dimensions

Width	266 mm
Height	185 mm