Voice over broadband, Internet Telephony, Voice over Internet Protocol (VoIP). There are many different names for the simple notion of using data connections to make and receive voice calls. This can cause confusion about the services that are available and whether they are suitable for business use.This guide is primarily for owners and managers of small and medium-sized businesses who are considering the benefits of upgrading or replacing their existing telephone systems and may have multiple sites to connect. Read how IP Telephony represents the future for voice services and can provide both immediate and longer term benefits.