Products · Mitel
Mitel OpenScape Voice: support, maintenance and upgrades
Mitel OpenScape Voice, formerly HiPath 8000, is a fully SIP-based platform for very large organisations, with two data centres active at the same time. We help you with OpenScape Voice support and operations, upgrades, redundancy and integration with Teams and Mitel CX, and with the SBC that protects the traffic between your network, your operator and Teams.
We usually start with a simple inventory of your PBX, licences and integrations.
About Mitel OpenScape Voice
Telephony in the data centre, built to keep running
OpenScape Voice is a voice platform built entirely on SIP, designed for the same availability requirements as the operators’ own systems, with a built-in media server. It runs as software in the data centre and handles up to 100,000 users per system. Mitel targets organisations with 10,000 users or more, and service providers.
The platform was formerly called HiPath 8000 and comes from Siemens and Unify. The servers can be located in two data centres that are both active, with a third site that decides which side continues if the link between them breaks. The latest version is V11.
We have many years of experience with OpenScape Voice in large environments and are certified on Mitel CX with OpenScape Voice.
Last updated 25 October 2026.
At a glance
- Fully SIP-based, runs as software
- Up to 100,000 users per system
- Two active data centres with automatic failover
- Latest version V11
- On your own servers, with a service provider or hybrid
- Works with Teams, Zoom, Mitel CX and Workflow Studio
Support
Support and maintenance for OpenScape Voice
We support OpenScape Voice in all versions, including older HiPath 8000 systems. If you have an older version, we can upgrade it so that it receives Mitel’s fixes again. We also take over support from other providers, as part of our third-party PBX maintenance.
What’s included
- Fault reporting and troubleshooting, with remote access that you control
- Contact with Mitel when a case needs escalating
- Changes, such as users, numbers and permissions
- Mitel’s security fixes, applied according to a plan
- Software Assurance and your licences with Mitel
- Regular reviews of the platform and a plan for the next step
We describe what a support contract should include in the guide PBX support contracts.
Fault reporting
Report faults as set out in your support contract, which also states the hours that apply. No contract with us yet? Call +46 8 730 66 00 or email info@icomserv.com.
How we help you
What we do with Mitel OpenScape Voice
Managed service
We can run the platform for you, in your environment or as a private cloud hosted in Sweden, with monitoring and changes.
Upgrades
From V10 to V11, with checks of integrations and licences.
Redundancy and failover
Two active data centres, backup routes to the operator and regular tests.
SBC and SIP trunks
The connection to the operator’s phone lines and numbers over the internet (SIP trunks) and to Teams, with protection where your network meets the operator’s.
Teams
Direct Routing with OpenScape SBC or a certified SBC from AudioCodes.
Contact centre and automation
Mitel CX and Workflow Studio on top of the platform.
Use cases
How Mitel OpenScape Voice is used
Two data centres
Both are active, so telephony continues if one data centre goes down.
Many sites in one system
The whole organisation on one platform, with branches connected via SBCs and local gateways.
Contact centre with Mitel CX
Voice and digital channels on top of OpenScape Voice, with a softphone for agents.
Teams Direct Routing
Teams and OpenScape Voice share a numbering plan, so you can move at your own pace.
Organisations that cannot afford downtime
Mitel mentions emergency services, healthcare and finance, among others.
Service providers
Several organisations on the same platform, kept separate from each other.
Works with
- Microsoft Teams via Direct Routing, with OpenScape SBC or AudioCodes
- Zoom Workplace
- Mitel CX (requires OpenScape Voice V10 R3 or V11)
- Mitel Workflow Studio
- OpenScape 4000 and OpenScape Business
- SIP trunks via OpenScape Branch and SBC
What we review first
- Current version and the plan for V11
- Data centres and the network between them
- Requirements for availability and backup routes
- SBCs and SIP trunks
- Integrations: contact centre, Teams and alarms
- Software Assurance status
How we work
From the first conversation to day-to-day operations
01
Discovery
We review how you work today, which systems you have and what you want to achieve.
02
Proposal
You receive a concrete proposal covering technology, timeline and cost, and we explain our choices.
03
Implementation
We install, integrate and test, and we train your users and administrators.
04
Operations and support
After go-live, we stay with you for support, updates and further development.
Common questions
Frequently asked questions about Mitel OpenScape Voice
Who is OpenScape Voice for?
Very large organisations, according to Mitel from 10,000 users upwards, and service providers. One system handles up to 100,000 users.
How does it differ from OpenScape 4000?
OpenScape Voice is fully SIP-based and runs as software in the data centre. OpenScape 4000 also handles analogue and digital extensions and wireless DECT phones directly. The two can be connected.
Can two data centres share the PBX?
Yes. The servers can be at different sites and both be active, with a third site that decides which side continues. We describe how backup routes can be built in the guide Redundancy and failover for telephony.
Does it work with Teams?
Yes, via Direct Routing with OpenScape SBC or a certified third-party SBC, such as AudioCodes.
Can we add Mitel CX?
Yes. Mitel CX 3.0 works with OpenScape Voice V10 R3 and V11.
Can it run in the cloud?
Yes, with a service provider that shares the platform between several customers, or as a hybrid with part of it running in your own environment. We can also run it for you as a private cloud hosted in Sweden.
Further reading
Guide
Redundancy and failover for telephony
Dependencies, backup routes and how to test that continuity holds.
Solution
Critical communications
Resilient telephony, contact centre and alarms, with redundancy and backup routes, for organisations that cannot afford downtime.
Product
Mitel CX
Contact centre for voice and digital channels, with AI, on top of Mitel PBXs such as MX-ONE and OpenScape.
Guide
Teams and your existing PBX: coexistence and gradual migration
How to let Teams and your PBX work together while you move at your own pace.
Solution
Third-party PBX maintenance
Keep the PBX that works. We take over support for MX-ONE, OpenScape and OmniPCX Enterprise and keep your PBX up to date with the manufacturer’s security fixes.
Guide
Upgrade or replace your PBX?
Decision support for organisations that run MX-ONE or OpenScape today.
Third-party PBX maintenance
Start with an inventory
Do you have an MX-ONE, OpenScape or OmniPCX Enterprise? We usually start with a simple inventory of your PBX, licences and integrations, free of charge. You then know where you stand, and we can give you a quote for support, operations or replacement.