01
Aging Infrastructure
Legacy hardware becomes harder to support, more expensive to maintain and less aligned with modern communications requirements.
Use Case — Legacy to IP Migration
Migrate from legacy voice to secure IP communications without disrupting operations.
Modernize analog, TDM, PRI, BRI and legacy PBX infrastructure through Mediatrix gateways and Sentinel SBCs—while preserving critical devices, call flows, carrier access and business continuity throughout the migration.
Since 1992Telecom engineering heritage.
Microsoft CertifiedSentinel SBCs for Teams voice.
25,000+ CustomersGlobal communications deployments.
Canadian DesignedSecure voice infrastructure technology.
Legacy → SIP/IP
ANALOG • TDM • PBX • PRI/BRI • SIP • UC • CLOUD VOICE
GATEWAYS
SBC
SIP TRUNKS
UC READY
AnalogLegacy endpoints
SIPModern interconnection
IPFuture-ready foundation
Phased MigrationModernize step-by-step without forcing a disruptive full cutover.
Legacy InterworkingBridge analog, PRI, BRI, TDM and PBX systems into SIP/IP voice.
Secure SIP EdgeUse Sentinel SBCs for SIP normalization, routing and voice-edge security.
UC ReadinessPrepare infrastructure for Teams, UCaaS, SIP trunks and modern cloud voice.
The migration challenge
Legacy telephony cannot simply be replaced overnight.
Most organizations still depend on a mix of analog devices, PRI/BRI trunks, TDM systems, legacy PBXs, elevator phones, alarms, fax, branch systems and critical workflows. The challenge is not only moving to SIP. The challenge is doing it without breaking operations.
02
Operational Dependency
Analog and PBX systems often support elevators, alarms, branches, call flows, emergency lines and business-critical communications.
03
Migration Risk
A full replacement can create service disruption unless legacy and IP systems coexist during a controlled transition.
Technical schematic
Bridge legacy voice systems into a secure SIP/IP architecture.
Mediatrix gateways preserve existing analog, digital and PBX connectivity while Sentinel SBCs secure the SIP edge, normalize signaling and connect the environment to SIP trunks, UC platforms and cloud voice services.
Legacy Voice Layer
Analog devices, TDM, PRI/BRI, PBX, fax, alarms, elevators and branch telephony.
Mediatrix Gateway + Sentinel SBC
Interworking, SIP conversion, session control, security, routing and topology protection.
Modern IP Voice Layer
SIP trunks, Teams, UCaaS, contact centers, cloud PBX and enterprise IP communications.
Architecture layers
Legacy-to-IP migration works best as a layered architecture.
Each layer has a specific role: preserve legacy service, convert interfaces, secure the SIP edge and prepare the organization for future communications.
Legacy Interface LayerAnalog, FXS/FXO, PRI, BRI, TDM, PBX ports and existing devices that still need continuity.
Gateway Interworking LayerMediatrix gateways bridge analog and digital telephony into SIP/IP networks.
SIP Conversion LayerVoice traffic is converted and adapted to modern SIP infrastructure and carrier services.
SBC Security LayerSentinel SBCs protect, normalize and control SIP traffic at the network border.
UC Integration LayerConnect to Microsoft Teams, UCaaS, cloud PBX, contact centers and modern collaboration platforms.
Lifecycle Modernization LayerReduce legacy dependency over time while expanding IP voice capabilities.
Recommended platforms
M5 Technologies platforms for legacy-to-IP migration.
The right platform depends on legacy interfaces, SIP security requirements, scale and whether the migration is site-based, enterprise-wide or service-provider led.
| Platform | Best Fit | Typical Migration Use Case | Key Advantage | Deployment Profile |
|---|---|---|---|---|
| Mediatrix 4102 / 4102S | Analog endpoint preservation | Fax, alarms, elevator phones, intercoms and small analog migration | Compact analog-to-SIP migration with DGW-powered control | Focused endpoint migration |
| Mediatrix / Audiotrix C-Series | Multi-line analog migration | Branch offices, buildings, facilities, analog devices and POTS replacement | Scalable analog migration while preserving continuity | Building / branch / multi-line |
| Mediatrix G7 / Digital Gateways | PRI, BRI and TDM transition | Legacy PBX interconnection, digital trunks and TDM-to-SIP migration | Bridge digital telephony into SIP and IP voice | Enterprise / PBX modernization |
| Sentinel SBC 100 / 400 | Secure enterprise SIP edge | SIP trunking, Teams Direct Routing, PBX migration and carrier interconnection | Security, topology hiding, routing and SIP normalization | Enterprise / multi-site |
| Sentinel CS / DGW50 | Virtual or large-scale migration | Virtual SBC, service provider, cloud-aligned or high-scale enterprise migration | Software-driven scalability and deployment flexibility | Virtual / hosted / private cloud |
Migration scenarios
Where legacy-to-IP migration delivers immediate value.
M5 Technologies supports practical modernization programs where existing infrastructure cannot disappear overnight but must evolve toward SIP and IP.
Legacy vs modern
Why the move to IP voice changes the operating model.
IP migration is not only a technology refresh. It changes how voice is secured, scaled, routed, monitored and integrated with modern communications platforms.
| Requirement | Legacy Environment | Modern SIP/IP Architecture | Business Impact |
|---|---|---|---|
| Carrier Connectivity | PRI, BRI, analog trunks or TDM circuits | SIP trunks with SBC security and routing control | More carrier flexibility and reduced legacy dependency |
| Voice Platform | PBX-centric and hardware-dependent | UC, Teams, cloud PBX, contact center and hybrid voice | Better alignment with modern collaboration and mobility |
| Security | Limited voice-edge controls | SBC-based topology hiding, SIP normalization, TLS/SRTP support | Stronger voice perimeter and interconnection discipline |
| Scalability | Constrained by physical circuits and legacy hardware | Scales through SIP, virtual SBCs and IP infrastructure | More flexible growth and multi-site expansion |
| Operations | Harder to monitor and support | Improved diagnostics, centralized routing and clearer architecture | Reduced support complexity over time |
| Migration Risk | High if replaced all at once | Phased coexistence with gateways and SBCs | Lower disruption and better business continuity |
Migration rationale
Reduce migration risk with a phased legacy-to-IP strategy.
Many organizations cannot retire legacy systems immediately. A phased model lets the business modernize while protecting critical devices, sites, numbers, workflows and operating procedures.
Risks of unmanaged migration
- Unexpected disruption to analog devices and branch systems.
- Broken call flows between PBX, carrier and UC platforms.
- Loss of visibility during transition.
- Security gaps when SIP trunks are introduced without SBC control.
- Cost overruns from poorly sequenced replacement projects.
M5 migration advantages
- Gateway-based continuity for analog and digital systems.
- Sentinel SBC security for SIP edge transformation.
- Controlled coexistence between legacy and modern voice.
- Clear migration path toward Teams, UCaaS and SIP trunks.
- Flexible deployment for enterprise, critical infrastructure and service providers.
Migration journey
How a legacy-to-IP migration project typically works.
A successful project aligns existing infrastructure, operational risk, gateway selection, SBC architecture and future communications goals.
1. InventoryDocument analog devices, PBXs, PRI/BRI trunks, sites, carriers and critical call flows.
2. DesignDefine gateway placement, SBC topology, SIP routing and coexistence requirements.
3. BridgeConnect legacy systems to SIP/IP using Mediatrix gateways and Sentinel SBCs.
4. ValidateTest call flows, emergency lines, fax, alarms, PBX, SIP trunks and UC integration.
5. ModernizeExpand IP voice, reduce legacy dependency and move toward UC or cloud communications.
FAQ
Legacy to IP Migration questions.
What is legacy-to-IP migration?
Legacy-to-IP migration is the transition from analog, TDM, PRI, BRI or legacy PBX infrastructure to modern SIP and IP-based communications while preserving service continuity.
Why not replace everything at once?
Many environments depend on legacy systems for critical workflows. A phased migration reduces risk, protects operations and allows controlled modernization.
Can analog and IP systems coexist?
Yes. Mediatrix gateways and Sentinel SBCs help legacy analog, digital and PBX systems coexist with SIP trunks, UC platforms and cloud voice.
Where does a Session Border Controller fit?
The SBC secures and controls the SIP edge by providing topology hiding, SIP normalization, routing control, policy enforcement and interconnection security.
Which M5 products support this migration?
Mediatrix gateways, Audiotrix adapters, Sentinel SBC 100/400 and Sentinel CS/DGW50 can support different migration scenarios.
Can M5 help assess existing legacy infrastructure?
Yes. M5 Technologies can help evaluate line counts, PBX dependencies, SIP trunks, sites, analog devices and the right migration architecture.
Legacy-to-IP migration assessment
Build a practical migration path from legacy voice to modern IP communications.
Whether you are modernizing analog devices, migrating PRI/BRI trunks, evolving a legacy PBX, deploying SIP trunks or preparing for Microsoft Teams, M5 Technologies can help define the right architecture.
- Analog, TDM, PRI, BRI and PBX migration planning
- Mediatrix gateway and Sentinel SBC platform selection
- SIP trunking, UC and Teams readiness
- Hybrid coexistence and phased migration strategy
- Critical infrastructure and multi-site modernization support