Voice over Internet Protocol (VoIP) is on track to replace fixed lines to deliver phone calls to homes and businesses. Vonage VoIP residential area include, Skype and now Google Voice. Companies are replacing obsolete systems with digital service providers today delivery Hosted PBX call, hosted IP PBX VoIP, Virtual PBX and more. If you plan to implement or have already implemented VoIP, you should check the network quality of service (QoS) priorities.
Problems of voice quality of VoIP can have several causes. Prioritization of voice or lack or poor quality of services is a major source of problems in VoIP. This article provides information on the quality of service that should be applied to the network and provides an explanation of what to do.
QoS gives priority to VoIP packets on the network bottlenecks. The point of the most common network bottlenecks, for most homes and businesses, is where the transitions of the data traffic from the local area network (LAN) Internet connection. The LAN can run at speeds of 10 MB to 100 MB (megabits per second) or more. DSL and cable Internet can have a high-speed Internet as low as 256 Kbps (thousand bits per second). In essence, the data is in transition from one freeway to 10 lanes to Highway 1. As VoIP is very sensitive to delays, it must wait its turn to enter the path of a track, an Internet connection.
QoS is implemented via a router examines each packet and ships the specifics of the head of the line. QoS can be achieved by virtual LANs (VLAN) or service code point of differentiation (DSCP) field in the type of service for IPv4 or IPv6 traffic class octet. For those familiar with the seven layers of the network, VLAN operates at layer 2 and layer 3 is DSCP.
VLAN
A VLAN is a virtual network that creates smaller broadcast domains within the local network to ensure efficient use of bandwidth. For example, your VoIP phone can be grouped into a VLAN and equipment in another. The voice VLAN can separate and protect VoIP traffic by service interruptions caused by a virus or worm activity due to Ethernet switches may not bridge IP traffic between VLANs.
VLAN data transport of Internet traffic in general is assigned the lowest priority. Voice VLAN is the highest priority.
DSCP
DSCP is based on the packets are classified and marked as belonging to a specific class. DSCP aware routers implement per-hop behavior (PHB), which implement the mechanisms for sending packets to each traffic class. DSCP is the primary protocol routers use to provide different service levels.
Although a network can implement up to 64 different classes of traffic, some encodings the DSCP field are recommended. Most networks use PHB is commonly defined by default, the transfer speed (EF), Assured Forwarding (AF) and the class selector. The EF PHB is intended for applications that require low delay, low jitter and low packet loss, which makes it suitable for VoIP, video and other services in real time.
The main disadvantage of DSCP is any application can cause the bit to compete with EF and mission-critical traffic on your network. For example, your company can use a virtual PBX instead of a traditional phone system. Calls to the public switched telephone network must pass through the Internet with a loss of delay, jitter and packet low. A router between the LAN and the Internet offers priority packets marked with EF to the Internet. Employees in your company personnel can use Skype, Google Voice or other video services that can compete with the bit and EF and mission-critical traffic to VoIP. This problem is solved by routers convinced that they can inspect all packets and just keep the bits EF packets destined for specific IP addresses.
Although more difficult to implement, VLANs can provide superior voice prioritization if their computers and VoIP phones are different devices. VLAN give priority to all traffic within the subnet that the call signaling. DSCP is easier to implement, but is less accurate. However, small networks, such as small businesses and homes, install a router with DSCP traffic management is sufficient.
Insufficient prioritization of voice is the only source of problems for VoIP. Please read " 7 most common causes problems with voice quality VoIP "to learn about other sources of problems. Visit my site to learn how to Hosted VoIP can help your business. You can contact my engineers with expertise in sales 866-242-6161.
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