WHAT IS SIP?
SIP by definition is Session Initiation Protocol. This is a method upon which the phone calls you make are delivered across internet and data network. These calls are effectively translated from one technology to another so that a call from a data network can be delivered to a fixed line PSTN network or to a mobile network across what the telco industry refers to as a SIP Trunk. SIP is made up of 2 basic components being the TRUNK – think of this as the infrastructure or a pipe that the calls flow through. The other component is the CHANNELS – the number of concurrent calls that are allowed to flow though the trunk. SIP trunks also allow other forms of data to travel through them such as video. But for the sake of voice – it is the technology most of us know as VoIP (Voice over Internet Protocol)