Residential VoIP providers usually have one or two voice mailboxes, one or two phone lines, one phone number, no extensions, one virtual extension/forwarding number, and either cheap or unmetered minutes per month. So, given that the playing field is so level, each company wants to be as straightforward as possible in listing their low prices, explaining the features, and highlighting any unique features, if any, that they have.
Business VoIP providers, in addition to phones and minutes, provide a host of software and hardware solutions that are far beyond what any home would need. In addition to the aforementioned auto-attendant, business VoIP providers offer SIP trunking, telepresence, and conference bridges, just to name a few. Many VoIP providers, such as OnSIP and Vocalocity offer a robust desktop application that integrates with other programs. Others have call center-specific software that analyzes call queues and helps supervisors best help their agents help their customers.