![]() Unlike older digital voice services like Primary Rate Interface (PRI) service, SIP trunking thus doesn’t actually require you to pay for individual trunk lines. The diagram below shows a highly simplified overview of how a call between SIP endpoints differs from a call made over a SIP trunk: The provider can then connect calls to and from the traditional phone network with extensions on your phone system. Here’s how it works: You use broadband internet to connect your VoIP phone system to your SIP provider’s network. ![]() The answer is nothing-unless the business has SIP trunking service.Ĭompare Products Registering a SIP provider in Digium’s Switchvox phone systemĪ SIP trunk isn’t a physical phone line, but rather a service provided by companies (known as SIP providers) over your internet connection. But what happens when a VoIP user wants to call a phone that’s connected to the traditional phone network instead of the internet? With a VoIP system, calls travel over the internet rather than traditional phone lines, which is why services like Skype can offer free calling. While VoIP is a much broader term, SIP trunking is a central part of how VoIP phone systems work. You’re probably more familiar with the term “business VoIP” than you are with SIP trunking. In this guide, we’ll explain how SIP trunking works and how it can help your business slash your monthly phone service bills. While SIP trunking probably won’t bring rates back down to what they were in 1912, the potential savings are still pretty major. ![]() Price list in Rates of Public Utilities in Wisconsin, Part V: Telephone Rates (1912)
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