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What UCaaS deployment model suits enterprises with hybrid infrastructure?

Answer

Enterprises with hybrid infrastructure should pick a hybrid UCaaS model that keeps regulated voice and call recording on a private edge or on-premises session border controller, while routing meetings, messaging, and PSTN trunks through the public cloud [1][2]. About 88% of organizations now run hybrid IT, making this the default pattern for regulated or multi-site deployments [3].

Segment fit matrix

Feature Regulated enterprise Multi-site global Cisco/Avaya brownfield
Private SBC for SIP trunking ✅ Required 🟡 Recommended ✅ Required
On-premises call recording vault ✅ Required 🟡 Recommended 🟡 Recommended
Cloud meetings and messaging ✅ Required ✅ Required ✅ Required
Local survivability gateway ✅ Required ✅ Required ✅ Required
SD-WAN with QoS marking ✅ Required ✅ Required 🟡 Recommended
Direct routing to Microsoft Teams 🟡 Recommended 🟡 Recommended — Skip
Phased migration tooling ✅ Required ✅ Required ✅ Required

Key terms

Provider model

Hybrid UCaaS

Deployment combining a cloud UCaaS tenant with on-premises session border controllers or local survivability gateways.

Technical dependency

Session border controller

On-premises appliance that secures SIP signaling and provides PSTN failover for cloud voice.

Technical dependency

Local survivability

Edge device that keeps internal calls running when the WAN link to the cloud UCaaS provider fails.

Compliance requirement

Data residency

Regulatory rule requiring call recordings or PII to remain stored in a specific country or region.

Outcome metric

Cloud bursting

Pattern where steady-state load runs on private infrastructure and spikes overflow to public cloud.

Providers to consider

Cisco Webex Calling

Webex Calling is built for hybrid voice with explicit on-premises survivability and dedicated instance options. With 12+ million cloud calling users worldwide, it is the obvious fit when there is an existing Cisco UCM or CUBE footprint to preserve.

Microsoft Teams Phone

Teams Phone supports Direct Routing through customer-owned SBCs, so enterprises can keep carrier contracts and PSTN breakout on-premises while running the call control in M365. With 320 million Teams MAU, the user-side rollout is mostly already done.

RingCentral

RingCentral fits hybrid enterprises that want a managed cloud tenant plus BYO carrier through SBC integration. Ten years as a Gartner Magic Quadrant Leader signals the operational maturity needed for global multi-site hybrid rollouts.

Citations

4 total

[1] What is a hybrid cloud deployment? Models & best practices
[2] Cloud Computing Deployment Models
[3] A guide to hybrid cloud deployment models
[4] https://flexicloud.co/blogs/cloud-deployment-models

More in UCaaS

4 total

When should a business switch from VoIP to UCaaS?
What UCaaS bandwidth requirements should businesses plan for?
What UCaaS features matter most for remote teams?
What UCaaS features matter most for small businesses?

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