What is Asterisk? Well Asterisk is a complete PBX in software form and provides all of the features one expects from a PBX with added extras. With Asterisk there is the option to have voice over IP in four protocols and it works with almost all standard-based telephony equipment, plus Asterisk supports a number of hardware devices, allowing interconnection with digital and analogue telephone equipment.
Adopting Asterisk and deploying an Asterisk Telephone System will provide a voicemail service that includes a Directory, Call Conferencing, Interactive Voice Response and Call Queuing. There is also support for such features as caller ID services and Three-Way Calling; in fact its many features adaptability and inexpensive use of hardware make it a popular choice for VoIP technology.