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BTI Is Your Certified Mitel Partner for Sales and Support 

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The MiVoice Office/Inter-Tel 5000 Phone System

BTI Communications Group has over 30 year’s experience installing and maintaining all of the Inter-Tel and Mitel platforms introduced over the years. These products have been through several naming conventions beginning with Inter-Tel Axxess whose software was used on the Inter-Tel 5000 hardware, then the Mitel HX, then the Mitel MiVoice Office 250.

BTI supports hundreds of local and national companies that use these systems exclusively.  If you are looking for expert on-site and remote support for your MiVoice Office, you’ve found the right partner.


Mitel MiVoice Office Portfolio Includes

The MiVoice Office is a superior solution for applications that require sophisticated call routing, SIP trunking, and connectivity to digital, analog, and IP devices in one management portal.

Unified Communications Controllers

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Key Features

  • Unified voice messaging with e-mail synchronization
  • Voice conferencing
  • Desktop phone twinning
  • Enhanced audio conferencing
  • Inter-Tel 5000

  • MiVoice Office 250


Unified Communications Controllers 

  • Inter-Tel Axxess

  • Inter-Tel 5000

  • Mitel 5000

  • Mitel HX

  • Mitel Office 250

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Contact Center

  • MiContact Center Business

  • MiContact Center Enterprise

  • MiTel Workforce Optimization

  • MiVoice Connect Contact Center

  • Mitel InAttend – Connect to Your Customers

  • CMG Suite

  • MiContact Center Outbound

Mitel MiVoice Key Features

  • Single enterprise identity

  • Dynamic extension

  • Single number reach

  • Hot desking

  • Teleworker

  • Auto-Attendant

  • Flexible day/night mode

  • Call routing

  • Unified messaging

  • Flexible music on hold

  • Enhanced call screening

  • Embedded Meet Me conferencing

Phones and Accessories

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  • Mitel 6900/6800/5300, IP 400 Series & Accessories 

  • 600 DECT Handset Series 

  • SIP-DECT Base Station 

  • Single Cell DECT Solution 

  • Integrated DECT Headset 

  • Mitel 5634 Wi-FI Phone 

  • Mitel Analog Devices 

  • MiVoice 1560 PC Operator 

  • MiVoice 5380 Operator 

  • MiVoice Business Console 

  • MiVoice Connect 

  • PhyBridge PoLRE

Ready to learn more?

Call or text one of our offices

615 N 48th St, Suite #1048

Phoenix, AZ 85008
p. 602-733-6807

Mitel and InterTel Phones We Still Support

  • Mitel 5304

  • Mitel 5320

  • Mitel 5330

  • Mitel 5340

  • Mitel 5360

  • Mitel 8528

  • Mitel 8568

Supported Inter-Tel Phones​​

Inter-Tel 550.8560


Inter-Tel 550.8520


Inter-Tel 550.4400


Inter-Tel 550.4500

Check out how Mitel Networks Corporation Powers Connections! 

Call or text one of our offices today for a free consultation

615 N 48th St, Suite #1048

Phoenix, AZ 85008
p. 602-733-6807

We Provide Businesses with Reliable Mitel Communication Solutions

Industry Driven

Logistics, construction, healthcare, and medical professional businesses are just some of the many companies we support. Regardless of your company size or the complexity of your VoIP communication requirements, we can help!

Superior Support

 We take the time to understand your business and properly configure your systems according to best practices for your industry. Our support services are designed to ensure that you and your system are in sync and operational when that call occurs. 

Security & Compliance

Your VoIP system connects the Internet to your business for communication purposes and also thereby poses a threat to compliance and cybersecurity.  BTI provides affordable outsourced monitoring, patching, software upgrades, and remote administration, so you can stay compliant and secure.   

Dedicated Expert Staff

Field and phone support MiVoice Office Engineers all have more than a decade of experience serving companies like yours using MiVoice Office.  These engineers and consultants are dedicated to your success.  

BTI Communications Group offers a wide range of business communication services, Business Phones, cellular boosting, Internet Access and Telecom Brokerage, Paging & Emergency Notification, VoIP Service, Web & Audio Conferencing Service and Equipment, VoIP Infrastructure & more. With BTI you get more than just an installation company or VOIP service provider, we help you maximize the ROI from your technology investment. 

Key Features of Our Service

  • Scalable communication solutions that grow with your company

  • Easy deployment, fast and efficient services

  • Real-time system and network health alerts

  • 24/7/365 support

  • Certified engineers and consultants

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Call or text us one of our offices to speak with one of our security experts

615 N 48th St, Suite #1048

Phoenix, AZ 85008
p. 602-733-6807

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What Our Clients Say About Our Mitel Services

BTI consistently solves IT challenges that our staff doesn't have the skill or time for. Their installation team is excellent and their support always makes sure all of our issues are solved.

Jonathon Huff

The Moody Church

BTI has been exactly what our growing company has needed for so long! They provide friendly, professional service and have consistently been willing to go above and beyond to ensure our complete satisfaction.

Rebecca Gadomski

Edgewood Clinical

The entire team at BTI has exceeded my expectations. They took my company to the technology and security level I needed.

Dave Tourje

Alpha Structural, Inc.

Top BTI Articles 

Start With A Free Consultation

We will provide the following at no cost:

Multiple Locations to Better Serve You

BTI Downers Grove

1441 Branding Ave Suite #200

Downers Grove, IL 60515

p. 312-432-5300

BTI Santa Fe Springs

12155 Mora Drive, Suites #1&2

Santa Fe Springs, CA 90670

p. 562-298-5000

BTI Phoenix

615 N 48th St, Suite #1048

Phoenix, AZ 85008
p. 800-435-7284

  • Itemized and fully transparent quote with no hidden costs or fees

  • No charge site survey

  • Detailed scope of work and review of the recommended solution

Tell us about yourself
Get started on a solution that saves

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