Administrator’s Guide for Akuvox SP-R5xP IP Phones
Akuvox Proprietary and Confidential. Copyright © 2014 Akuvox network Co., Ltd..
Page
126
of
221
6. Click OK to reboot the IP phone.
To configure VPN via phone user interface after uploading a TAR file:
1. Press Menu > Settings > Advanced Settings (password: admin) > Network > VPN.
2. Press Up or Down to select the desired value from the VPN Active field.
You must upload the OpenVPN TAR file using configuration files or via web user interface in
advance.
3. Press the Save to accept the change.
The IP phone reboots automatically to make settings effective after a period of time.
Quality of Service
Quality of service (QoS) is the overall performance of a telephony network, particularly the
performance seen by the users of the network. To quantitatively measure quality of service,
several related aspects of the network service are often considered, such as error rates,
bandwidth, throughput, transmission delay, availability, jitter, etc.
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 simply based on the DiffServ class. The DSCP value
ranges from 0 to 63 with each DSCP specifying a particular per-hop behavior (PHB) applicable
to a packet. A PHB refers to the packet scheduling, queuing, policing, or shaping behavior of a
node on any given packet.
Four standard PHBs available to construct a DiffServ-enabled network and achieve
