Working with Your Existing PBX Technology
Hybrid deployments allow you to integrate Microsoft Teams with your existing telephony infrastructure. Whether it's a phased migration or permanent interoperability, we handle the complexities of legacy PBX integration, analog devices, and specialised equipment.
What is a Hybrid Voice Deployment?
A hybrid deployment allows Microsoft Teams and your existing PBX to coexist, enabling gradual migration or permanent dual-platform operation.
The Best of Both Worlds
Hybrid deployments provide the flexibility to migrate to Teams at your own pace while maintaining existing telephony investments. Users on Teams can call users on the legacy PBX, and vice versa, with seamless call transfer and presence integration.
This approach is particularly valuable for organisations with significant PBX investments, complex contact centre integrations, or specialised telephony requirements that need time to replicate in Teams.
Whether you're planning a multi-year migration from Avaya, Cisco, or Mitel, or need to maintain certain functions on legacy systems permanently, hybrid deployments provide the bridge between old and new.
Interoperability
Seamless calling between Teams users and PBX users without visible boundaries to end users.
Gradual Migration
Move users to Teams in phases - department by department, site by site, or role by role.
Business Continuity
Maintain existing call flows and integrations during migration to minimize disruption.
Investment Protection
Extend the life of existing telephony infrastructure while transitioning to cloud calling.
Hybrid Deployment Approaches
Different technical approaches to integrating Teams with legacy PBX systems.
SBC-Based Integration
A Session Border Controller acts as the bridge between Teams (via Direct Routing) and your existing PBX. This provides the cleanest integration and most flexibility.
- SIP trunk between SBC and PBX
- Direct Routing to Teams
- Intelligent routing between platforms
- Number translation and dial plan normalization
Dual-Platform Trunking
Maintain separate SIP trunks to both Teams (via SBC) and the legacy PBX, with intelligent routing at the carrier level.
- Independent platform operation
- Carrier-based number routing
- Simplified architecture
- Platform redundancy options
Contact Centre Integration
Maintain existing contact centre platforms while moving general users to Teams.
- Keep agents on legacy platform
- Teams for general workforce
- Transfer between platforms
- Migration path to Teams contact centre
When to Consider Hybrid Deployments
Common scenarios where hybrid voice deployments provide value.
Phased PBX Replacement
Migrating 500+ users from legacy PBX to Teams? Hybrid deployment enables site-by-site or department-by-department migration over months or years without disrupting operations.
Specialised Equipment Integration
Maintain analog devices, elevator phones, door entry systems, or other specialised equipment on the PBX while moving general telephony to Teams.
Contact Centre Migration
Keep contact centre agents on existing platform with advanced ACD capabilities while moving general office users to Teams calling.
Multi-Site Gradual Rollout
Organisations with multiple sites can pilot Teams at one location while maintaining existing systems elsewhere, proving the platform before broader rollout.
Regulatory or Compliance Requirements
Industries with specific call recording, archiving, or emergency services requirements can maintain compliant systems while evaluating Teams capabilities.
Vendor Contract Timing
Still have time on your PBX maintenance contract or trunk agreements? Hybrid approach lets you transition on your timeline, not the vendor's.
Phased Migration Approaches
Different pathways from hybrid to full Teams deployment.
By Department or Team
Move specific departments to Teams while others remain on PBX. Ideal for organisations with distinct functional groups and clear organisational boundaries.
Functional Migration
By Location or Site
Migrate entire sites or offices to Teams while others stay on PBX. Works well for multi-site organisations with site-specific infrastructure.
Geographic Migration
By User Role or Type
Move mobile workers and remote staff to Teams first, keeping reception, call centre, and power users on PBX until advanced features are replicated.
Role-Based Migration
Pilot & Expand
Small pilot group validates the platform, identifies issues, and becomes champions. Then expand in waves based on lessons learned.
Proven Approach
Hybrid Deployment Done Right
We've successfully integrated Teams with Avaya, Cisco, Mitel, Unify, and other PBX platforms. Our experience spans simple dual-platform environments to complex multi-site migrations involving thousands of users.
We understand legacy PBX platforms and Teams equally well - this dual expertise is critical for successful hybrid deployments that actually work in production.
Discuss Your MigrationLegacy PBX Expertise
Deep knowledge of Avaya, Cisco, Mitel, and other platforms - we speak both languages.
Integration Architecture
Design and implement the SBC and routing logic to seamlessly bridge Teams and legacy systems.
Coexistence Management
Manage both platforms during transition, ensuring consistent user experience across both.
Decommissioning Support
When ready, we help retire the legacy platform cleanly - canceling contracts, removing infrastructure, final cutover.
Planning a Hybrid Teams Deployment?
Book a consultation to discuss your existing infrastructure and design the right migration path to Teams.
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