When thinking about Voice Over Internet Protocol, also known as VoIP, popular consumer services like Vonage, Skype and Google Voice come to mind. A lot of the businesses today have stop using their landline telephone systems and switched to services commonly known as Hosted Voice Over Internet Protocol, Hosted Private Branch Exchange, Internet Protocol Centrex and Virtual Private Branch Exchange from business voice over internet protocol providers. Although, adding voice over IP to older telephone systems is gaining popularity through Session Initiation Protocol, more commonly knowns as SIP Trunking.

SIP trunking is not only for newer telephone systems that accept is directly but also for older telephone systems...

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