Yealink VC400 Administrator's Manual

Also see for VC120: Getting started Recovery guide Quick guide Administrator's guide User guide

Administrator’s Guide for Yealink Video Conferencing Systems94To configure intelligent firewall traversal via web user interface:1. Click on Network->NAT/Firewall.2. Select the desired value from the pull-down list of Intelligent Firewall Traversal.3. Click Confirm to accept the change.Quality of ServiceQuality of Service (QoS) is the ability to provide different priorities for different packets in thenetwork. This allows the transport of traffic with special requirements. QoS guarantees areimportant for applications that require a fixed bit rate and are delay sensitive when the networkcapacity is insufficient. There are four major QoS factors to be considered when configuring amodern QoS implementation: bandwidth, delay, jitter and loss.QoS provides a 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 networkThe Best-Effort service is the default QoS model in the IP networks. It provides no guarantees fordata delivery, 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 simpleand scalable mechanism for classifying and managing network traffic and providing QoS on