MOS

Mean Opinion Score (MOS) is the overall measurement of the quality of a telephony service. In reference to your internet connection, MOS is a score that reflects the quality of voice communications such as VoIP, Skype, and other services that use your internet connection.

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What is MOS?

The score ranges from 1 to 5, with a theoretical maximum of 4.4 (because of overhead caused by codecs used to encapsulate voice over the wire). It is calculated by average latency, average jitter, and packet loss.

A = (latency + jitter) * 2

If A < 160 then B = 93.2 - ( A / 40 )

If A >= 160 then B = 93.2 - ( A - 120 ) / 10

C = B - ( packet loss * 2.5 )
MOS = 1 + (0.035) * C + (.000007) * C * (C-60) * (100-C)

A MOS score above 4.0 should support most VoIP applications, provided the bandwidth is also available.

Business VoIP
Residential VoIP
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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
RingCentral	RATED #1 BY INDUSTRY EXPERTS Includes 100+ Premium Features Unlimited Calling, Faxing, SMS, Conferencing Trusted by over 350,000 Businesses As low as, per month/user	$0.00	14 day trial available to new subscribers	Free	^$ 19.99 _/mo. * Core Advanced Ultra Month to Month (per user) $30/user/mo Annual Contract Paid Monthly (per user) $20/user/mo Annual Contract Prepay (per user) $20/user/mo Month to Month (per user) $35/user/mo Annual Contract Paid Monthly (per user) $25/user/mo Annual Contract Prepay (per user) $25/user/mo Month to Month (per user) $45/user/mo Annual Contract Paid Monthly (per user) $35/user/mo Annual Contract Prepay (per user) $35/user/mo 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.	4.1 142 reviews 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!
Talkroute	The phone system built to do business anywhere Video Meetings & Text Messaging Call Forwarding & Routing Desktop, Mobile, & Web Apps $5 per additional user	$0.00	-	Free	^$ 19.00 _/mo. *	5 1 review Get Quote!
Verizon Business VoIP	Get 99.99% network reliability with Fios. Business Digital Voice 1-year price guarantee Unlimited data Per month. Plus taxes, fees and equipment charges.	$0.00	-	Free	^$ 69.00 _/mo. *	1.35 56 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.

Find out how much you can save today on Residential VoIP.

Compare top Residential VoIP providers in the table below

Provider	Plan Features	Rate/min.	Trial Period	Setup Fees	Monthly Fees	Details
Ooma Telo	HOME PHONE SERVICE Special: Save on hardware & low monthly rates! No annual contracts, 30-day money back guarantee Unlimited nationwide calling *Not including taxes/fees + One-time hardware cost of $99.99	$0.00	30 days	Free	^$ 19.95 _/mo. * Ooma Office Month to Month (per user) Ooma Office $19.95 /mo. In order to determine the number of users you need for your Ooma Telo phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	4.85 203 reviews Get Quote!
VoIPo	VoIPo Home Phone Unlimited Calls to US/Canada Over 45 Features + Free 2nd Line Free international call allowance $15.00/mo. or $6.21/mo. with 2 year contract	$0.00	30 days	Free	^$ 6.21 _/mo. * Residential Month to Month (per user) No contract $15.00 / mo. Annual Contract Prepay (per user) 2-year contract $6.21 / mo. In order to determine the number of users you need for your VoIPo phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	3.65 49 reviews Get Quote!
1-VoIP	HOME PHONE SERVICE Unlimited Calling and Free Adapter Included No Contract or Cancellation Fee Over 40 Included Features $8.97 is monthly cost with 1-year prepay	$0.00	-	Free	^$ 8.97 _/mo. *	4.95 5 reviews Get Quote!
Axvoice	Home Phone Service Unlimited USA and Canada calling Free hardware and activation Money back guarantee, 30+ features $6.25/mo. 1-year prepay equals $75.00/year	$0.00	15 days	Free	^$ 6.25 _/mo. * Home Phone USA/Canada US/Canada 200 Pay As You Go Month to Month (per user) No contract $14.99 / mo. Annual Contract Paid Monthly (per user) 1-year postpay $10.99 / mo. Annual Contract Prepay (per user) 1-year prepay $6.25 / mo. Month to Month (per user) No contract $9.99/mo. Annual Contract Prepay (per user) 1-year postpay $5.99/mo. Month to Month (per user) No contract $4.99 / mo. In order to determine the number of users you need for your Axvoice phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.	4.25 75 reviews Get Quote!
Community Phone	Modern Landline Service No internet required, works even during power outages. Setup is as easy as connecting a charger to a phone, anyone can do it. Unlimited local and long-distance calling. Device contains a backup battery and is not designed to run without electricity indefinitely.	$0.00	30 days	$99.00	^$ 32.50 _/mo. *	5 7 reviews Get Quote!

Find out how much you can save today on Wholesale VoIP

Compare top Wholesale VoIP providers on the table below

Provider	Summary	Features	Ratings
VoIP Innovations	Established in 2007, VoIP Innovations brings success to its customers through Wholesale VoIP services. They are an industry leader in Wholesale VoIP, and have been aggregating, innovating and...	API, Calling Card, Colocation, E911, International A-Z, Origination, Portal, Termination, Toll Free	4.3 9 reviews Get Quote!
Alcazar Networks	A nationwide provider in the VoIP and ISP provider industries, Alcazar Networks has been providing technology solutions since 2003. They aim to deliver products that will help businesses increase...	API, Calling Card, E911, International A-Z, Origination, Portal, Termination, Toll Free	5 1 review Get Quote!