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One of the most robust APIs available on the market.  FREE!
Our  API  has  you covered
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Local Voice  -  Toll Free  -  International  -  SMS  -  e911  -  iFAX
SIP Trunks with QuestBlue
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QuBe PBX, Our New Software!
When using your QuBe PBX with QuestBlue Systems, you can easily be up and running in minutes. From your easy-to-navigate user portal, you can order all communication services in real-time: DIDs (telephone numbers), SIP Trunks, 911 services, and you can manage refill options to keep your account going. All of this can be done without ever having to call up and ask for a new phone number. In just a couple clicks and a few seconds you will have a working phone number pointing to your PBX.

Registration is required to download software.
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Managed Service Providers

Grow your business without a volume commitment. Use our white label QuBe PBX and simplify your daily routine without your customers ever seeing or knowing of QuestBlue.


Easily Deploy custom, high quality services across any size footprint. Adding additional locations as your company grows is as simple as it comes. We will proactively be there to support your growth every step of the way.

Hosted Voice

Utilize our cloud services as you run your business and we host your servers and routing.

Why QuestBlue?
QuestBlue offers tiered pricing with unbeatable market rates. We’re compatible with any SIP endpoint, server, switch, or gateway. All of your services are delivered from the QuestBlue cloud via our high availability data centers. Our systems detect potentially dangerous and fraudulent traffic, protecting you and your business. With our technology, we guarantee that your call goes directly to your destination without the middleman. 
Why the right provider is critical
Our Enterprises, carrier group service providers, managed service providers, and Reseller VoIP providers trust QuestBlue SIP trunking to deliver the highest quality and reliability to maintain their voice connections and keep them profitable around the globe.
The scalability of our network guarantees unlimited channel availability, while giving you the power to manage your entire operation in real-time. You’ll be routing calls to QuestBlue in minutes with our instant SIP Trunk turn-up process from our easy-to-use portal or our extensive API. Need phone numbers? Not a problem! Our worldwide selection of DIDs will be routing by the time you select order in your user portal.
Free QuBe PBX with branding
If you’ve been searching for a quality GUI to Asterisk, look no further! QuestBlue has released a GUI, with all modules included, for free. A robust, easy-to-use, and easy to install PBX that you can download and install on your own hardware or host it in our cloud. Remove the QuestBlue branding and replace it with your own when using QuestBlue SIP Trunking for origination and termination! Imagine installing your own branded PBX, in your MSP program, with operator panels, built in assisted dialer, full point and click setup with fully supported updates. If you require an additional item in your PBX, we will work to build it for you! Here's the best part, we will build it, drop it into an update for all users, and the updates are all free!
The API difference
When it comes to our API, we have Five 9's of API Success Rate. Our rate is the true indicator of your app's success. We won’t settle for errors that slow you down. If our API is missing something, we will add it.
Every service with QuestBlue is part of our extensive worldwide network. SIP Trunks, origination, termination, and instant provisioning of every service is available to you with our connections all over the globe.
Join the growing list of businesses that trust QuestBlue to deliver their communications. We have award-winning support, with the ability to scale to your requirements with superior quality. Let our team help you grow and trust that we will be here for you when you need us.

Grow Your

Company Today

We take pride in helping launch MSP's voice services. 

Do you fall into the Managed Service Provider (MSP) category?
We support you, and our PBX software that you can install
and service under your own brand.  Hosting your clients PBX in our cloud will strengthen your success and your end user will never know we exist as you grow your industry.
Only pay for what you use! Rates starting at $0.009/minute. Call volume brings greater discounts!
Local and toll free DIDs starting at $0.50/month. Volume accounts may be eligible for greater discounts! International DIDs also available for $14.95 per month.
Important parts of getting your system up and running, we offer full support of E911 and CNAM for all of our DIDs.
Our powerful API allows you to have total control over your account. Seamless integration into your system
With QuestBlue, you only pay for what you use. As you increase volume, our team will work with you to create volume discounts that serve your needs with no contractual agreement.





Quality Support.

QuestBlue is committed to providing the best PBX and VOIP / Enterprise SIP Trunking technology and support to serve your needs. Our advanced API is available to all accounts at no additional cost.

Since 2007, we have supplied our customers with more than just SIP trunks, PBX systems, or telephones.
We have been a business partner along with a trusted provider of comprehensive product lines and infrastructure solutions.

We have backed our services with a solid guarantee, fast and friendly services, and incredible sourcing capabilities.
Our mission is to listen to our client's specific needs and deliver high performance products through continuous product innovation and operational excellence. 

To this end, we operate out of a fully redundant data center to ensure you are provided service consistently and reliably.