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Reliable VoIP overany set of network connections

Enterprise class Voice-over-IP (VoIP) is a challenging application to run over a wide area network (WAN). End-to-end Quality of Service (QoS) must be provided to ensure that whenever congestion occurs, VoIP packets still get to where they need to go. On top of that there needs to be sufficient bandwidth to support the appropriate number of concurrent calls alongside other business applications on the network. With each call taking up 24 to 80Kbps of bandwidth, depending on the CODEC, it is easy to eat up a significant fraction of an expensive T1 MPLS circuit just with voice.

Talari's Adaptive Private Networking technology for WAN Virtualization addresses the challenging requirements of voice in a number of ways:

Abundant Bandwidth

Bandwidth using APN is 30 to 100 times cheaper than private WAN bandwidth, so businesses can afford to provision much more bandwidth for any given application. Existing bandwidth previously provisioned only for VPN-based backup or local Internet access can be used, and of course additional inexpensive broadband links can easily be added. This alone can significantly reduce the problem of too many applications competing for too little bandwidth.

Ingress QoS

An APN conduit between two sites can have up to 10 classes of service which allows VoIP packets to be assigned the appropriate priority relative to email or file transfers for instance. This guarantees that VoIP packets are not delayed in getting on to the WAN. To determine which traffic is VoIP and deserves real-time priority, Talari’s Mercury APN appliances can be configured to honor IPTOS and DSCP markings and also can be configured to make this classification decision based on flow characteristics such as port number and/or source or destination IP address.

Congestion Avoidance

At the start of a call, APN will automatically pick the path which currently has the best characteristics for a voice call (low loss, low jitter). Since APN continually monitors these characteristics of a path it can quickly reroute VoIP packets, within a fraction of a second, to a new path with minimum disruption in call quality.

Optional Packet Replication

To offer the highest possible call quality it is possible to trade additional — and thanks to APN, inexpensive — bandwidth for ‘platinum’ quality voice. By replicating voice packets over two disparate paths across the network, suppressing duplicates at the receiving appliance, the destination APN appliance will use the most timely of two VoIP packets and be able to hide packet loss or excessive delay on either of the paths.

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