What is Asterisk? (VoIP PBX Software)

What is Asterisk?

Asterisk is an open-source software program published by Digium that you can use to enable a PC to run as a server for a VoIP service. Asterisk can also be used to develop telecommunications applications.

Because Asterisk is an open-source system, you have full access to Asterisk’s source code. With this open source software, you can develop your own services and features based on Asterisk's capabilities and components. Asterisk software is free to download and use. Generally, you shouldn't need any extra hardware with Asterisk either.

The biggest selling point for Asterisk is that it allows you to turn any computer into a fully functional IP PBX. Asterisk was made to run on Linux, but other Asterisk servers include BSD, Windows, and Mac OS X. However, with a bit of technical knowledge, you can configure Asterisk to run on pretty much any operating system.

Find out how much you can save today on Business VoIP

Compare top Business VoIP providers in the table below

Provider	Plan Features	Rate/min.	Trial Period	Setup Fees	Monthly Fees	Details
Jive VoIP	Upgrade your phone service with Jive Voice Very simple to use for admins and users Get your first month free No fees for upgrades, features or add-ons Price is per month per device.	$0.00	30 days	Free	^$ 19.95 _/mo. * Small Business Month to Month (per user) 1 - 4 users (Tier 1) $29.95 / mo. 5 - 9 users (Tier 2) $25.95 / mo. 10 -24 users (Tier 3) $23.95 / mo. 25 - 49 users (Tier 4) $21.95 / mo. 50 - 100 users (Tier 5) $19.95 / mo. In order to determine the number of users you need for your Jive VoIP phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	4.7 275 reviews Get Quote!
RingCentral	RATED #1 BY INDUSTRY EXPERTS Includes 100+ Premium Features Unlimited Calling, Faxing, SMS, Conferencing Trusted by over 350,000 Businesses 30 Day Trial with same day activation	$0.00	30 day trial available to new subscribers with 2+ users.	Free	^$ 19.99 _/mo. * Standard Premium Enterprise Month to Month (per user) 1 user $49.99 / mo. 2 - 19 users $34.99 / mo. 20 - 99 users $31.99 / mo. 100 - 999 users $29.99 / mo. Annual Contract Paid Monthly (per user) 1 user $42.99 / mo. 2 - 19 users $27.99 / mo. 20 - 99 users $24.99 / mo. 100 - 999 users $22.99 / mo. Annual Contract Prepay (per user) 1 user $34.99 / mo. x 12 2 - 19 users $24.99 / mo. x 12 20 - 99 users $21.99 / mo. x 12 100 - 999 users $19.99 / mo. x 12 Month to Month (per user) 1 user $54.99 / mo. 2 - 19 users $44.99 / mo. 20 - 99 users $41.99 / mo. 100 - 999 users $39.99 / mo. Annual Contract Paid Monthly (per user) 1 user $47.99 / mo. 2 - 19 users $37.99 / mo. 20 - 99 users $34.99 / mo. 100 - 999 users $32.99 / mo. Annual Contract Prepay (per user) 1 user $44.99 / mo. x 12 2 - 19 users $34.99 / mo. x 12 20 - 99 users $31.99 / mo. x 12 100 - 999 users $29.99 / mo. x 12 Month to Month (per user) 1 user $69.99 / mo. 2 - 19 users $59.99 / mo. 20 - 99 users $54.99 / mo. 100 - 999 users $49.99 / mo. Annual Contract Paid Monthly (per user) 1 user $62.99 / mo. 2 - 19 users $52.99 / mo. 20 - 99 users $47.99 / mo. 100 - 999 users $42.99 / mo. Annual Contract Prepay (per user) 1 user $59.99 / mo. x 12 2 - 19 users $49.99 / mo. x 12 20 - 99 users $44.99 / mo. x 12 100 - 999 users $39.99 / mo. x 12 In order to determine the number of users you need for your RingCentral phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	4.15 137 reviews Get Quote!
OnSIP	CLOUD VOIP TAILORED TO YOU Free Polycom phones + 30 day trial Unlimited calling, 10 devices per user New voice chat button for your website 5 user minimum	$0.00	30 days	Free	^$ 18.95 _/mo. * Unlimited Pay As You Go Month to Month (per user) No contract $18.95 /mo. Month to Month (per user) No contract $0.00 / mo. + $0.029 / min. This is NOT an introductory price. Actual price. To calculate the total number of users, count your employees. (Employees can have up to 10 phones each).	4.7 53 reviews Get Quote!
PGi	STANDARD HOSTED VOICE Unlimited Calling USA & Canada Full PBX Features Available Under 100 seats, add $ 2	$0.00	30 day paid trial	Free	^$ 19.00 _/mo. *	5 1 review Get Quote!
Comcast Business Phone	Crystal-Clear Calling on Our Gig-Speed Network Unlimited nationwide calling & 24/7 support Great for fax or point-of-sale lines Uses your own phone equipment	$0.00	-	Free	^$ 29.95 _/mo.	5 1 review Get Quote!
ClarityTel	Business VoIP Made Clear and Simple Unlimited Calling & Flat Rate Billing Over 40 Enterprise Class Calling Features No Contract, Quick & Easy Setup Price based on multi-user hosted PBX solution	$0.00	30 days free trial	$0.00	^$ 14.99 _/mo. * Business Month to Month (per user) Business $19.99 / mo. In order to determine the number of users you need for your ClarityTel phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	5 2 reviews Get Quote!
VoIPstudio	Hosted PBX Telephone lines/numbers available in 50 countries All features included in user subscription fees Web Control Panel for all users Price per user per month	$0.00	30 days	Free	^$ 19.99 _/mo. * Pay As You Go Unlimited Domestic Unlimited International Month to Month (per user) No contract $4.99 / mo. + $0.014 / min. Month to Month (per user) No contract $19.99 / mo. Month to Month (per user) No contract $39.99 / mo. In order to determine the number of users you need for your VoIPstudio phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	5 1 review Get Quote!
Alliance Phones	Alliance Phones Simple set-up in less than 30 minutes Efficient daily call report Easy-to-use control panel 12% discount for subscribing and paying for a year upfront.	$0.00	30 days	Free	^$ 19.97 _/mo. * Effortless Plus Simplicity Plus Easy Plus Month to Month (per user) 20 - 100 users $19.97 /mo. Annual Contract Prepay (per user) 20 - 100 users $17.58 /mo. x 12 Month to Month (per user) 4 - 20 users $24.97 /mo. Annual Contract Prepay (per user) 4 - 20 users $21.98 /mo. x 12 Month to Month (per user) 1 - 3 users $29.97 /mo. Annual Contract Prepay (per user) 1 - 3 users $26.38 /mo. x 12 In order to determine the number of users you need for your Alliance Phones phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	5 13 reviews Get Quote!

*Rates shown do not include E-911 charges, taxes, and surcharges. Most providers offering unlimited calling have restrictions and some rates shown are promotional rates based on term contracts or promotional periods. Be sure to read individual providers terms and conditions before you buy. Rates and features displayed for each provider have been sourced from provider's site and other online sources. While we strive to display current information, be sure to check directly with each provider as their plans, pricing, and features are subject to change.

Many people use Asterisk to develop PBX (public branch exchange) systems for their businesses. Asterisk can be used to create a fully operational PBX that can run on any computer. Asterisk has made it especially easy to use their program to build your PBX by providing you with a turnkey PBX solution.A PBX is the system that a business uses to route phone calls within an office, and to control traffic for incoming and outgoing calls. Originally, a PBX was a piece of hardware that had to be operated entirely by hand. A full-sized PBX could fill the better part of a small room.

Asterisk Gateway

Gateways are VoIP systems that allow you to bridge the gap between analog and digital data so that you can integrate analog phones into your office VoIP system.

Gateways are often required when you are using a SIP trunk service to enable a traditional hardware PBX and analog office phone system to work with VoIP. That is, you can get VoIP for your office without replacing your phones or other equipment.

Asterisk IVR

IVR, or Interactive Voice Response, means that a customer calling your company phone can operate through the menu by using voice commands. This can greatly improve your company’s customer experience. You can build an IVR program with Asterisk so that your office phone menu will be arranged in the way that you think is best.

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