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SIP VoIP Phone Service Provider

Today, we’re ranking the top SIP phone service providers around the world. SIP phone service is becoming an increasingly helpful solution for people and businesses looking for affordable phone services.

One of the biggest advantages of SIP is that you can take a standard mobile phone with a built-in SIP client and connect it to any SIP-based service provider in order to use that provider as your mobile carrier. The SIP provider will ride on the network of other data service providers over your mobile phone.

Of course, SIP trunking also lets you turn international or long distance calls into local calls, saving you fees on international calling rates.

Ultimately, that adds up to cost savings for your business and greater convenience for you. With that in mind, let’s take a closer look at the best SIP VoIP service providers available today.

Editor’s Note: Looking for information on VoIP Phone Systems? Use the questionnaire below and our vendor partners will contact you to provide you with the information you need:


Vonage is the biggest provider of SIP-based VoIP to PSTN gateway services. Vonage is also widely known for basically launching the VoIP industry: they were one of the first biggest providers on the scene starting in the early 2000s.

Vonage’s SIP plans emphasize flexibility and affordability. Today’s Vonage Business plans sell the TGP 500 and TPA 50 phones, both of which are made by Panasonic and offer a wide range of SIP functions.

The TPA 50 phone is a cordless handset ideal for traveling around your office. Its IP functionality makes it easy to connect to existing VoIP services and it doesn’t compromise on features or quality.

Meanwhile, the TGP 500 is a better choice for workers who mostly stay at their desks. It has 8 lines along with a backlit display, connectivity with up to six cordless handsets, and a programmable speed dial. Ultimately, it claims to help you get more done in less time.

Vonage also has a mobile app available for iPhone and Android. You can use these mobile apps for video calls and managing just about everything related to your PBX system.

Vonage uses SIP for its signaling protocol. Although its plans tend to be higher-priced than many competitors, Vonage continues to emphasize call quality and a feature-rich experience. You can also connect a third-party SIP softphone to Vonage fairly easily because the Vonage server uses SIP in a standard-compliant way, making swapping phones in and out straightforward.

Vonage also uses SIP forking that easily allows multiple phones to register.

Ultimately, Vonage is one of the top SIP VoIP phone service providers on the market today and offers plans that scale to meet the needs of all different types of businesses.


8×8 is another popular SIP trunking provider. 8×8’s SIP trunking offers a flexible VoIP dial tone solution that can scale to meet the needs of everything from small to large businesses. The company emphasizes low upfront costs and fast deployments while also offering rates that tend to be lower than competitors.

Some of the key features of 8×8’s SIP trunking services include:

  • Free and unlimited calling between 8×8 enabled sites
  • No minimums and you can scale up your business through the company’s “pay-as-you-grow” system
  • Keep your existing phones, phone system, and phone numbers when making the switch
  • Utilize your existing internet connection
  • Inbound/outbound service
  • Toll-free numbers

The platform is also fullyE-911 and CALEA compliant and is known for its call clarity.

Another key feature of 8×8 is that you can have unlimited concurrent calls. Unlike traditional phone lines where you can only make one call per line, you can make an unlimited number of concurrent calls without needing to pay for extra lines. This is a key advantage of SIP trunking on more than just 8×8.

In terms of functionality, 8×8 SIP trunking connects your IP-enabled phone system to the PSTN and works with tier 1 providers across the nation to deliver high-quality voice service.

Startup costs tend to be slightly higher than other SIP trunking providers, but the cost goes down significantly over time due to cheaper monthly rates.

For example, the standard monthly fee for 8×8 SIP trunking services varies by year:

  • 1 Year: $39.99 per month ($250 startup fee)
  • 2 Years: $34.99 per month ($150 startup fee)
  • 3 Years: $50 per month ($50 startup fee)

Other pricing features include adding on toll-free numbers for $1.49 to $4.99 per month. You can also buy prepaid nationwide minute bundles that include 2500, 5000, 10,000, or 10,000+ outbound calling minutes.

Ultimately, 8×8’s cost savings can have a significant impact when you’re a larger company. In one savings chart seen here, 8×8 claims that you can save $11,962.32 over a 2 year period with 8×8’s SIP trunking. That example assumes that you have a 15 person company only using 8 lines during peak hours. The total cost for traditional phone service would be $14,746.08 while the total cost for 8×8 trunking is $2,783.76, leading to the $11.92.32 cost savings.


OnSIP, as you may have guessed from the name, specializes in SIP trunking.

With OnSIP, you get an on-premise PBX solution that uses VoIP to handle calls to and from the PSTN.

OnSIP trunking comes included with every OnSIP account, so there’s no need to add-on a package or bundle to your existing VoIP account.

OnSIP also prides itself on its compatibility and supports some of the world’s most popular software-based PBX systems, including Freeswitch, Trixbox, Fonality, and Asterisk.

The company is also known for its pay-as-you-go pricing. Unlike Vonage, OnSIP does have a minimum fee of $49.95 per month, making it the most expensive provider out of the three listed here.

However, that monthly minimum fee is waived for the first 30 day after you open an account, and there are no upfront setup costs, so the price difference isn’t quite as significant as you might think.

Some of the features and services available through OnSIP’s SIP trunking services include:

  • OnSIP Trunking (UDP + TCP): Free with your OnSIP account, although you need to pay a minimum of $49.95 per month
  • Local Phone Numbers (DIDs): $7 setup, plus $2 per month per number thereafter
  • Number Porting (LNP): $15 per number
  • Vanity Number Request: $25 per request
  • Inbound Calling: 2.9 cents per minute local rate,
  • Inbound Toll-Free Calling: 3.9 cents from the US48 states, 9.9 cents from Canada, 30 cents from Puerto Rico, 20 cents from Hawaii, 75 cents from Alaska, 9.9 cents from callers with no caller ID, and an additional 50 cents from payphone calls.
  • Inbound Calls from OnSIP Network: 0.5 cents per minute
  • Outbound Calling: 2.9 cents to US48, most of Canada, and 20+ other international destinations.
  • International Outbound Calling: You can see the company’s full selection of outbound international calling rates here.

OnSIP’s SIP trunking also offers phone numbers for every local area in the United States. Another advantage is that customers are never locked into a long-term contract. You pay as you go and can cancel any time without penalty.

If you want to bundle your company’s entire calling platform with OnSIP, then you may also want to bundle it with OnSIP Hosted PBX, which provides all of the standard PBX features you need for your business. Vonage and 8×8 also offer this PBX functionality.

Why SIP Trunking Will Benefit your Business

SIP, or Session Initiation Protocol, lets you setup communications over the internet between you and the public switched telephone network (PSTN).

The main difference between SIP and traditional telephony is that bundles of physical wires are not used to connect your business to the telephone network. In traditional telephony, you had to use 100 wires to make 100 active phone lines.

A SIP trunk, on the other hand, is just a local connection from one point to another over the internet and is not restricted by physical wires.

Other advantages of SIP trunking for your business include:

No More BRIs, PRIs, or PSTN Gateways

Basic Rate Interfaces (BRIs), Primary Rate Interfaces (PRIs), and local PSTN gateways are not required for SIP VoIP platforms. When you don’t have to purchase these, you save money. You also don’t have to pay to upgrade as your company expands, which can save you even more money over the long-term.

No More Separate Voice and Data Connections

SIP trunking eliminates the need to have separate voice and data connections, which means you can use voice and data together over a single platform.

Turn All Calls into Local Calls

Companies can outsource their PSTN connectivity to a third party, reducing long-distance charges. Your call data is sent over the internet to a termination point owned by the service provider (8×8, for example, has 8000 points across the world). This allows you to avoid costly international calling fees.

Eliminate Costly 800 Numbers

SIP trunking service providers let you give customers local numbers to call instead of toll-free numbers. These calls are terminated locally before being delivered via the internet to the company’s call center. This can also make the company appear to be locally-based, or that the caller is being redirected to a local call center instead of a nationwide call center, which can increase customer service.

Ultimately, SIP VoIP phone service providers are a proven way to save money for your business. Vonage, 8×8, and OnSIP are the three top service providers available today and can offer enormous ROI over traditional phone lines and systems.

Editor’s Note: Looking for information on VoIP Phone Systems? Use the questionnaire below and our vendor partners will contact you to provide you with the information you need:

About Johnson Hur

After having graduated with a degree in Finance and working for a Fortune 500 company for several years, Johnson decided to follow his passion by embarking on a path to the digital world. He has over 8 years of experience with large companies setting marketing strategy.

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