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What Is SIP Trunking?
LAs Full Service Aserisk Shop
For enterprises wanting to make full use of their installed IP-PBXs and not only communicate over IP within the enterprise, but also outside the enterprise, a SIP trunk provided by an Internet Telephony Service Provider to connect to the traditional PSTN (Public Switched Telephone Network, or “plain old telephone service”) is the solution. Unlike in traditional telephony where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk allows a company to replace these traditional fixed PSTN lines with PSTN connectivity via a SIP trunking service provider on the Internet.

SIP trunks can offer significant cost-savings for enterprises, eliminating the need for local PSTN gateways, costly ISDN BRIs (Basic Rate Interfaces) or PRIs (Primary Rate Interfaces).

What Is Asterisk?
Asterisk is an open source telephone system. It’s comprised of software that turns an ordinary computer into a communications server. Like any PBX, it allows attached telephones to make calls to one another, and to connect to other telephone services including the public switched telephone network (PSTN) and Voice over Internet Protocol (VoIP) services.

Asterisk is released under a dual license model, using the GNU General Public License (GPL) as a free software license and a proprietary software license to permit licensees to distribute proprietary, unpublished system components. Asterisk powers IP-PBX (private branch exchange) systems, VoIP gateways, and conference servers. All of these are now widely used by small to large businesses, call centers, carriers, and governments worldwide.

Do Major Companies Use Open Source?
LAs Full Service Aserisk Shop
The entire back-end universe of both Google and Facebook is powered by open source technology. Other open source initiatives include: Linux, Apache, MySQL, Perl/php/Python, Firefox, and OpenOffice.org.
What Is Commodity Hardware?
Arrowtel World Class Phone Systems
To put it in simple terms, commodity hardware means computer hardware that is non-specialized, non-proprietary, and can be used for various purposes. In the case of most companies and phone systems, you are required to buy highly specialized proprietary hardware that can only be used for one single phone system. You cannot use that hardware for anything else. What that means is if you change phone systems, you will be required to purchase an entirely new set of hardware.

Arrowtel’s entire PBX runs on a computer (server). If you decide not to use this computer as your PBX server, you can use it for any number of other things including a server for another purpose or just a computer workstation for one of your staff. We prefer Dell products because of their price and quality.

What Is Open Source?
Open source software is computer software that is available in source code form, developed in a collaborative method through an open community and covered by a software license that permits users to openly and freely study, change, improve, and in the case of Asterisk, distribute the software for free.

Open source includes a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.

What Is VoIP-Voice over Internet Protocol?
Arrowtel World Class Phone Systems
Voice over Internet Protocol (Voice over IP, VoIP) is one of a family of internet technologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone.

Internet telephony refers to communications services—voice, fax, SMS, and/or voice-messaging applications—that are transported via the Internet, rather than the public switched telephone network (PSTN).

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