Glossary of Terms

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Term Definition
Software as a Service

Software as a Service (SaaS) is a software delivery method over the Internet. The software is hosted remotely, so organisations do not need to invest in additional hardware. Software as a Service removes the need for organisations to handle the installation, set-up and often daily upkeep and maintenance, meaning leaner and more responsive IT resources.

SIP Trunks

Session initiation protocol (SIP) trunks act as a bridge between a PBX and the public telephone network. If a client has their own PBX and we are supplying them with connectivity, then staff making calls would reach the public telephone network via a SIP trunk that connects to our core network.
For example, if a client wanted to make a call then the call data would go from their VOIP phone to their PBX using the local network. The data would then travel from the PBX to the exponential e core network via the EDD and from the core network to the public telephone network via SIP.

Session Initiation Protocol

Session Initiation Protocol (SIP) enables calls to be routed via the Internet rather than a telephone Network.


A computer or computer program which manages access to a centralized resource or service in a Network. Comprised of four main components: GPU, memory, storage, and Network.


SDN (Software Defined Networking) is the combination of a number of different technologies and concepts being brought together to change how Networks work. Software automates the configuration and management of the Network, removing the human element and the static nature of Network control and configuration.


SD WAN (Software Defined Wide Area Networking) is a transformational approach to simplifying networking between office locations, enabling agility across the Network and cost-effectiveness. It also enables IT departments to retain more control of their Infrastructure.