How to make voice traffic high priority

This is an optional enhancement to the configuration of the routers. It prioritises outgoing voice traffic higher than other outgoing traffic on each VPN, to maximise call quality.

Use the configuration in this section if you expect your VPN client or branch office users will be using VoIP over a VPN. The configuration consists of the following sections:

z"How to prioritise outgoing VoIP traffic from the headquarters router"

z"How to prioritise outgoing VoIP traffic from the branch office 1 router"

z"How to prioritise outgoing VoIP traffic from the branch office 2 router"

This enhancement prioritises outgoing voice traffic rather than incoming voice traffic, because the link to the ISP is the most likely point of congestion.

We recommend you configure prioritisation on both peers in each VPN, not just on the headquarters router, because the link from either peer to its ISP could become a point of congestion.

Note: This enhancement only prioritises outgoing VoIP traffic at the routers you configure it on. Of course, you cannot control the quality of service on routers in the Internet, such as your ISP’s routers.

Classifying In the following configurations, the router classifies voice traffic by checking packets’ IP DSCP VoIP traffic values. If the originating VoIP appliance does not mark packets with a DSCP value, you can

instead select the voice traffic by:

zclassifying on the range of destination ports that the appliance uses for RTP (Real Time Protocol—the protocol that carries voice data), or

zuse the Dynamic Application Recognition (DAR) system, which dynamically determines the ports

If you also need to classify the signalling traffic (call setup etc) and the signalling traffic is not DSCP-marked, then create classifiers for the appropriate ports. For example, H.323 signalling traffic uses TCP ports 1720 and 1721, and SIP uses UDP port 5060. To create classifiers for

H.323 signalling packets, use the following commands:

create classifier=<id> tcpd=1720

create classifier=<id> tcpd=1721

For more information, including information about DAR, see the following:

zthe “Software Quality of Service (QoS)” and “Generic Packet Classifier” chapters of the Software Reference

zHow To Configure Software QoS For Some Specific Customer Scenarios. This How To Note is available from www.alliedtelesis.com/resources/literature/howto.aspx.

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Allied Telesis AR440S manual How to make voice traffic high priority
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AR440S specifications

Allied Telesis offers a range of advanced routers designed to meet the connectivity and operational needs of modern enterprises. Among its extensive lineup, the AR450S, AR441S, AR415S, AR442S, and AR440S models stand out for their robust features and technologies, making them ideal solutions for various networking environments.

The Allied Telesis AR450S is a high-performance router tailored for service providers and large enterprises. It supports advanced routing protocols, including IPv4 and IPv6, ensuring compatibility with both legacy and modern networks. The AR450S boasts substantial throughput capabilities, making it suitable for bandwidth-intensive applications. Its versatile WAN options, including Ethernet and cellular connectivity, allow seamless integration into diverse network architectures.

Next in the lineup is the AR441S, which focuses on providing enhanced security and reliability. With built-in firewall capabilities and VPN support, this model ensures secure communication over the internet. The AR441S also features numerous Ethernet ports for flexible connectivity, enabling organizations to scale their networks as needed. Its user-friendly interface facilitates straightforward configuration and management.

The AR415S is designed for branch offices and small to medium-sized enterprises. This router offers a balance of performance and affordability, equipped with essential features like Quality of Service (QoS) and traffic shaping. The AR415S supports multiple WAN connections, which helps in maintaining reliable internet access by auto-failing to backup connections when necessary.

The AR442S incorporates advanced networking technologies, including dynamic routing protocols and deep packet inspection. This model enhances performance by optimizing traffic flow and improving bandwidth utilization. Its support for VoIP and other multimedia applications makes it an excellent choice for organizations seeking to maximize their communication capabilities.

Lastly, the AR440S is engineered for high availability and redundancy. It includes dual power supplies and hot-swappable components, ensuring that network services remain uninterrupted during maintenance. The AR440S is particularly valuable in mission-critical environments where downtime can lead to significant business disruption.

In summary, the Allied Telesis AR series routers—AR450S, AR441S, AR415S, AR442S, and AR440S—offer a rich set of features tailored to various operational needs. With their advanced routing capabilities, security features, and reliable performance, these routers represent the cutting edge of networking technology for businesses looking to enhance their connectivity and operational efficiency.
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