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Compare the Best SIP Providers of 2023

SIP trunking providers give you the best of both worlds: the improved functionality and cost-efficiency of VoIP phone plans and the ability to keep your current phone system. Some of the benefits of SIP include increased reliability (backed by the SIP trunk providers), caller ID, DID calling for every extension, local and long distance calling, E911 and more.

SIP providers like can customize their plans to provide top-notch SIP service. Check out these providers below on our SIP provider comparison table. Below the table, we have elaborated on some of the interesting features involved in SIP trunking.

Find out how much you can save today on SIP

Compare top SIP providers in the table below.

Image VoipPreview
Solutions Price Rating
Carefree Business SIP Trunks
  • Voice & SMS on the same number
  • Instant Number Provisioning, Nationwide coverage
  • Geo Redundant Servers, Automatic Failover
+ $0.0081/min. For US and Canada only. International rates apply

$ 9.97 /mo. *

*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.
VoIP-enabled phone

What Does SIP Trunking Accomplish?

SIP Trunking works in conjunction with your PBX to make for an affordable calling solution.

Some companies aren’t comfortable letting go of their current phone system, even though they still want to reap the benefits of Internet telephony. If you’re one of these companies, a SIP Trunking solution can let you have both.

SIP is short for “Session Initiation Protocol”, and it allows you to pack all data and voice connections into one, single line. Unfortunately, a SIP cannot function by itself. You still need an IP PBX to enjoy the features and functions of VoIP. With SIP Trunking, you can get VoIP connectivity without having to lose those customers who still want to talk via landline.

Technically speaking, SIP refers to a blending of data and voice connections into a single line. Instead of using both a phone network and a data network, you can use the Internet to transfer your voice and your data. SIP trunking uses your on-site PBX (the telephone switching system that you already have) to route the calls. But the difference in price comes from the consolidation of your connections and the increased efficiency that it brings.

In a nutshell, SIP Trunking gives you a kind-of universal phone line. It allows you to communicate with all the conveniences of modern VoIP technology. But at the same time, SIP Trunking also lets you stay in touch with anyone else who would still rather communicate over traditional phone networks.

sip trunking calls

How Can SIP Trunking Help Me?

SIP utilizes PBX features in one single line, which makes calling easy and hassle-free.

What you really want to answer is: why wouldn’t I want the best of both worlds? Some companies may have already invested in an on-premise IP PBX after realizing the exorbitant costs of a traditional PSTN. However, they may not have completely weaned themselves off of their landline as much as they hoped. Therefore, the next logical move for their business would be to connect their PBX to the Internet via SIP.

Here’s another scenario: you’re a growing company that already took the opportunity to put in your own IP PBX. But now, you’re starting to attract customers that are still using a traditional landline, and you have no idea how to help them reach you (at least, not without considering the dreaded costs of going back to PSTN).

Both cases still carry a risk of spending more money and can make the savings from an IP PBX seem too little. (If you’re starting to feel this way, try using our savings calculator so you can be sure.) The good news is that an IP PBX is really all you need to use SIP Trunking while still avoiding the higher cost of the old landline.


Why Does SIP Trunking Cost Less?

SIP Trunking costs less because you do not need additional hardware and only pay on a per seat or per minute basis.

There are a lot of technical references that explains why SIP Trunking can cost less than the trunks and circuits employed in PSTN (also called PRI Trunking). Below is a quick summary of what SIP can do for your business:

The cost of extensions: Increasing extensions for PRI Trunking can require the purchase of actual wiring, additional copper cables depending how many extensions you already have, and the usual labor costs for installation. In contrast, SIP Trunking can be set up mostly through software.

Backups are cheaper, too: When traditional phone lines go down, backing up for it still requires more manual installation. That means more fees, more equipment, and more headaches. That’s a lot of trouble when you can just re-route any call over the Internet courtesy of SIP Trunking.

Increasing capacity: Given the cost of just one extension, you can already imagine how much more it would cost you to expand the capacities of your communications. At this point, it’s very clear that SIP Trunking is the only way small business owners can have scalability without bankrupting themselves.

Upkeep and maintenance costs: While an on-site IP PBX requires its own maintenance, can you really compare that to the kind heavy equipment that was used by older, more traditional PBX models? The latter would charge you as much as $20 on just one copper cable, and it’s likely you’ll need at least 4-6 of these for a small business. Doing that math isn’t complicated. It’s definitely more expensive to grow with an older PBX model.

VoIP phones

What Else Do I Need Besides an IP PBX?

SIP Trunking requires an existing broadband connection and an existing PBX to function properly.

Knowing what you need is important if you intend to use SIP Trunking to merge both your current IP PBX and your connections to PSTN lines. The best answer is really to look at the IP PBX itself.

Is your bandwidth good enough?

This probably the first (and most practical) question to ask. Most people still think that poor quality of a call or a conference is the fault of the VoIP system. But in reality, your bandwidth has a big part to play in the quality of your calls (just like any other internet-based function). You could invest in the best IP PBX with state-of-the-art SIP Trunking, but if your bandwidth doesn’t cut it, you’re losing out on your investment. Run speed tests (like the one on our site) and try to pinpoint what’s really using your conection. Maybe put some policies in place to keep it under control and to ensure there is ample bandwidth for your VoIP service.

Do you need additional security measures for SIP Trunking?

Plenty of providers will always tell you that they’ve got top-notch security. That’s why you have to listen carefully to each one. The different ways that vendors protect you with their solutions may be effective; but that doesn’t mean that their methods are compatible with the way you run things. Some of them might even incur additional costs to PSI Trunking that you might not know about, so pay very close attention to your security needs as well as your communication ones.

What’s your plan for handling inbound calls?

It sounds like an innocent question, but think twice before answering. Remember, the strength of SIP Trunking lies in its capacity to keep you open to PSTN calls in addition to calls from a VoIP network. There’s little point in that if you don’t have a solid structure for incoming calls. The technology can direct and convert these calls with ease, but managing them is still up to you. How can you make it so that customers always get the assistance they’re calling for? How many times are they being re-routed before they are connected to the right person or department? Make sure technology isn’t just easy for your business but also easy for the people it serves.

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