There will be single channel, multi-channel,

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Making phone calls via the internet using VoIP is something we now tend to take for granted without necessarily thinking about what goes on beneath the surface. The underlying technology, however, is important and a basic understanding of it can help in deciding which system is right for you.

Behind every VoIP system – germany telegram indeed behind every phone call – is a carrier services infrastructure (CSI). This is the backbone system that ensures that calls can reach their destination. A CSI is typically made up of many different kinds of connection. Some will be fast, high bandwidth fibre connections, others will be slower, more limited copper connections.

switched and dedicated circuits. You can think of it as akin to a rail network, with fast, high capacity mainlines and smaller branch lines all contributing to an integrated whole that gets you where you want to go, albeit with three changes of train and a rail replacement bus service!


Types of CSI
Looking at different types of carrier infrastructure is something of a journey through a history of telecommunication. The CSI goes back to the very early days of telecommunication and the public switched telephone network (PSTN). This is the traditional way of making phone calls using switched lines to reach a particular destination. It may still be the endpoint for many calls that originate on VoIP.

Next was the evolution the digital service (DS), often in the form of a leased line, which allows a dedicated connection between two sites. After this comes the optical carrier (OC) which is a dedicated connection using an optic fibre link. Most recently there’s the rise of wireless and cellular networks that enable fast mobile connection.