While SIP and VoIP are occasionally used interchangeably, they are distinct concepts. VoIP, an acronym for Voice Over Internet Protocol, represents the general category of phone calls conducted over the internet. VoIP is often implemented alongside applications like Skype or Google Talk, through IP-enabled PBX hardware, or via hosted VoIP services. This umbrella term encompasses various protocol technologies, with SIP being just one example. In essence, SIP is a specific protocol among many that facilitate VoIP communication.
