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 colombia whatsapp number data 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.
CSI and VoIP
For specialists such as IDT offering wholesale DID origination services, a smooth running CSI is essential. This generally means a packet-switched network that combines DS, OC and wireless transports.
Because telecoms is a dynamic environment, networks are being upgraded all the time to take advantage of the latest technology. If, as a business, you have private, dedicated links between sites then they – or a portion of them – are dedicated to your VoIP traffic all the time. Once you make calls outside your own business, then you are using the public CSI offered by telecoms service providers.
Depending on the ultimate call destination, the data may be routed via several different carriers. This needn’t especially concern you as an end user as the routing and billing of the call is taken care of by arrangements between them. The key advantage of VoIP here is that because the call is dynamically routed via the internet, it finds the most efficient way through the CSI. This is in contrast to PSTN where the call takes a fixed route and is, therefore, going to be more costly.
For the end user, VoIP is a simple and cost-effective way of making phone calls, but there’s a lot going on beneath the surface.