SIP stands for Session Initiation Protocol and is basically a subset of Voice Over Internet Protocol or VoIP.
SIP is mostly used to transmit phone calls over the internet but with a more robust nature, giving a more quality and professional experience, which is why its a popular choice for businesses wishing to implement a VoIP phone system.
Why do we use SIP?
SIP allows people around the world to communicate using their computers, mobiles and other current technology all using the Internet. It is an important part of VoIP and allows you to have a rich communication experience which is ideal for a professional working environment.
SIP as a protocol is also very powerful and efficient in many ways. Many organizations use SIP for their internal and external communication, centered around a their current phone technology.