Inter-Tel Business Phone Manuals

Inter-Tel phone systems can still be found in businesses today.

Inter-Tel PBX Manuals for Axxess, GLX, MPK and Inter-Tel Telephone Guides

Inter-Tel, now part of Mitel, had several business phone systems that were deployed in SMBs and were very popular some years ago. These legacy phone manuals and guides are here for download for the telecom professional and owners who need some guidance when programming or making changes on their Inter Tel system. Below you can download the Inter-Tel Axxess, Encore, and GLX guides.

Inter-Tel Axxess is a legacy, modular, on-premise converged voice/data business phone system designed for small and midsize businesses, hotels, and similar organizations. It reached manufacturer end of life on May 30, 2014.

How to change the time and date on Inter-Tel telephones.

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Inter-Tel Telephone and System Manuals

Inter-Tel Axxess

Inter-Tel Axxess works with Inter-Tel digital phones and supports analog equipment such as standard single-line telephones, fax machines, paging interfaces, and certain adapters; depending on the installed hardware and software release, it can also support selected IP endpoints, VoIP functionality, and IP networking. Axxess was built as a dependable hybrid PBX combining traditional key-system usability with PBX flexibility, rather than as a modern cloud platform, which helps explain why many systems remained in operation for decades.

The Axxess platform reached official manufacturer end of life in 2014. As of September 2026, any system still operating is more than 12 years beyond formal manufacturer support, and individual cabinets, processors, phones, and circuit cards may commonly be 15 to 30 years old or more. These systems can still be repaired and maintained by independent legacy-PBX technicians using refurbished or surplus phones and hardware. Owners should retain current programming and voicemail backups, keep practical critical spares, and develop a migration plan in case aging hardware fails or compatible parts become difficult to obtain.

Inter-Tel Axxess Administrator Guide
Inter-Tel Axxess Desktop OAI Developers Toolkit
Inter-Tel Axxess Executive Keyset Guide
Inter-Tel Axxess IMX Keyset Guide
Inter-Tel Axxess Issue 4.3 Addendum
Inter-Tel Axxess Quick Reference Guide
Inter-Tel Axxess Single Line Guide
Inter-Tel Axxessory Talk Voicemail Guide

 

Inter-Tel Encore

Inter-Tel Encore Installation Manual
Inter-Tel Encore User Guide

Inter-Tel GLX, GLX PLUS, GX, & IMX

The Inter-Tel GLX, GLX Plus, GX, GMX, and IMX product families predate Axxess, in some cases substantially. They represent earlier generations of proprietary digital, hybrid key-system, and PBX equipment.

Inter-Tel GLX Keyset
Inter-Tel GLX Owner Guide
Inter-Tel GLX-PLUS Installation/ Field Maintenance Manual
Inter-Tel GLX Standard Keyset
Inter-Tel GMX-152D
Inter-Tel GMX 48 Installation & Maintenance Manual
Inter-Tel GX Keyset 1user Card
Inter-Tel GX Keyset 2
Inter-Tel GX Owners Guide
Inter-Tel IMX/GMX 256 832 Attendant Computer Console Manual
Inter-Tel IMX/GMX Installation/ Field Maintenance Manual
Inter-Tel IMX/GMX 416 832 Installation/ Field Maintenance Manual
Inter-Tel Inside Track User Guide Issue 2
Inter-Tel IVX 500 Installation & Field Maintenance Manual
Inter-Tel MPK I & MPK II
Inter-Tel Phoenix 824 Installation & Field Maintenance Manual
Inter-Tel 1232 Keyset

 

Inter-Tel 3000

Inter-Tel 3000 Administration Manual

 

About Inter-Tel

Inter-Tel was a company, traded on the NASDAQ that developed and produced telephone business systems. Mitel Networks Corporation and Inter-Tel merged in 2007 and Inter-Tel became a wholly-owned subsidiary of Mitel.

 

Inter-Tel Manuals FAQ

Where can I download Inter-Tel Axxess manuals?

This page provides downloadable Inter-Tel Axxess documentation, including the Administrator Guide, Desktop OAI Developers Toolkit, Executive Keyset Guide, IMX Keyset Guide, Issue 4.3 Addendum, Quick Reference Guide, Single Line Guide, and Axxessory Talk Voicemail User Guide.

Is the Inter-Tel Axxess phone system still supported by the manufacturer?

Inter-Tel Axxess reached manufacturer end of life on May 30, 2014. Systems can still be maintained by independent legacy-PBX technicians using available refurbished, surplus, or replacement equipment, but manufacturer support is no longer available.

What types of phones and equipment can an Inter-Tel Axxess system support?

Depending on the installed hardware and software release, Inter-Tel Axxess can support Inter-Tel digital phones, analog single-line telephones, fax machines, paging interfaces, selected IP endpoints, VoIP features, and IP networking.

Which Inter-Tel legacy systems have manuals on this page?

The page includes guides and manuals for Inter-Tel Axxess, Encore, GLX, GLX Plus, GX, GMX, IMX, IVX 500, MPK I and MPK II, Phoenix 824, Inter-Tel 1232 Keyset, and Inter-Tel 3000 systems.

What documentation is available for Inter-Tel GLX, GX, GMX, and IMX systems?

Available documentation includes GLX Keyset and Owner Guides, the GLX Plus Installation and Field Maintenance Manual, GLX Standard Keyset documentation, GMX-152D information, GMX 48 Installation and Maintenance documentation, GX Keyset guides, IMX and GMX Attendant Computer Console documentation, IMX and GMX installation and field-maintenance manuals, Inside Track User Guide, IVX 500 documentation, MPK documentation, and the Phoenix 824 Installation and Field Maintenance Manual.

What should an organization do before an aging Inter-Tel system fails?

Organizations operating an aging Inter-Tel system should retain up-to-date system programming and voicemail backups, keep practical critical spare equipment where appropriate, and develop a replacement or migration plan before a processor, cabinet, telephone, or circuit card failure creates an urgent outage.

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