Enterprise SIP -- that's Session Initiation Protocol technology for large enterprises -- is just starting to make its way into the vocabularies of big business leaders around the world. Big business is mildly notorious for being slow to change direction, but when they see a new technology that is clearly destined to profoundly affect the bottom line, they can move with startling agility -- and enterprise SIP is exactly such a telecommunications breakthrough.
SIP is an umbrella term for a variety of activities that, collectively, slash business communications costs -- and the bigger the business, the larger the savings. The basic elements of enterprise SIP are the SIP trunk, the PBX server, and the PSTN. That's a lot of technical terminology, but each part taken individually is pretty simple to explain. Let's start on the inside.
The 'inside' device is the PBX, or Private Branch Exchange server. Most modern PBXs are IP-enabled, or IP-PBXs. A PBX is essentially a powerful machine that acts as a voicemail server, call center, auto attendant, and provides calling features like conference calling, call forwarding, call holding, and more. Any time you call a large business and you get a non-human response, you're on the phone with a PBX. In all likelihood, your business already has a PBX in place -- it may even be an IP-PBX if it was purchased or upgraded recently.
The 'outside' device is the PSTN, or Public Switched Telephone Network. You probably call this "the phone company", but in a literal sense, it's a massive network of devices that 'switch' (as in 'switchboard') your phone call through a series of machines that eventually connect you to whatever number you just dialed on your phone. The PSTN is generally thought of as only available when you pick up a phone that's plugged into the wall, but that's not actually the case -- there is an alternate route to access the phone network, and it's available through SIP trunks.
The SIP trunk is a device that allows your PBX to talk to the PSTN without using a phone line. That's the strength of Enterprise SIP -- you get to skip out on all of the various expenses that are associated with having a phone line. All of them -- no taxes, fees, basic rates...nothing. And as any CFO knows, when you've got 50+ phone lines and you regularly use most of them, those charges build up fast.
Compare that to the low monthly fee of an SIP trunk and the one-time 'startup' expense of purchasing and installing an IP-PBX -- something your business likely already has -- and the reasons to switch to enterprise SIP are clear. There's not even any meaningful loss of functionality compared to a traditional phone line, because you keep your PBX server exactly like it is now, just with an added external device to access the SIP trunk. Nothing could be easier or more cost-effective, and that's why enterprise SIP is big business' vocab word of the month.
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