All of a sudden, all sorts of signals could be transmitted, rather than just voice. When the Integrated Services Digital Network (ISDN) entered the scene in 1988, it was a revolution. These signals hop from network to network until they reach the right ears. POTS is still the most widely used telephone connection you can get through your phone line, via electric signals carried by copper cables from your desk phone to the Public Switched Telephone Network (PSTN). The amusingly named Plain Old Telephone Service (POTS), was how businesses (and your grandma) communicated for over 100 years from 1876 until 1988. To understand SIP technology, it’s a good idea to take a look at the evolution of the systems that led to modern SIP trunking. It’s important to understand that whereas VoIP (Voice over Internet Protocol) is a broad term for any internet-based phone service (yes, that includes SIP trunking), SIP is a specific protocol that implements VoIP by creating start and end points, which determine messages during a call.īefore going into the details about how SIP trunks work, let’s jump back to almost half a century ago, and briefly cover the history of business telephony. Sometimes, the terms VoIP and SIP Trunking are used interchangeably, which isn’t entirely correct. The name stems from the acronym for Session Initiation Protocol (meaning the computer language that sends and receives calls) combined with the word ‘trunk,’ that techies define as ‘a connection between two points.’ A SIP Trunk replaces a traditional phone cable enabling you to make and receive voice (or video) calls over the internet. In short, a SIP Trunk is the digital equivalent of a phone line. Thankfully, it doesn’t take long to understand the basics of this powerful telecom technology and how to set it up for your company, despite the somewhat bewildering name.īelow, we cover how SIP trunking came to be, explain the function of SIP trunks, and how Aircall sets it all up for you in no time.īut first things first, let’s decipher the tech jargon. Making sense of SIP trunking is helpful if your business is pivoting to VoIP phone communications.
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