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What Is Unified Communication As A Service
Errin O\'Connor
8 min read
Unified Communications as a Service (UCaaS) is a cloud-delivered model that combines voice calling, video conferencing, instant messaging, presence, file sharing, and collaboration tools into a single integrated platform. Instead of purchasing and managing separate on-premises systems for each communication channel, UCaaS delivers everything through a subscription-based cloud service. Microsoft Teams is the leading UCaaS platform for enterprise organizations, and at EPC Group, we design, deploy, and manage Teams-based UCaaS environments for companies with 100 to 50,000+ employees across healthcare, finance, and government.
What UCaaS Includes
A complete UCaaS platform integrates multiple communication modalities that traditionally required separate systems and vendors:
- Voice calling (VoIP and PSTN) -- Make and receive phone calls over the internet. UCaaS replaces traditional PBX phone systems with cloud-based calling that includes auto-attendants, call queues, voicemail, call transfer, and PSTN connectivity for external numbers.
- Video conferencing -- HD video meetings with screen sharing, virtual backgrounds, breakout rooms, recording, and live captions. Replaces dedicated video conferencing hardware (Polycom, Cisco Tandberg) with software-based solutions accessible from any device.
- Instant messaging and chat -- Real-time text communication between individuals and groups. UCaaS chat is persistent (messages are saved and searchable), unlike SMS or older messaging systems.
- Presence and status -- Real-time indicators showing whether colleagues are available, busy, in a meeting, or away. Presence information is shared across all communication modalities.
- File sharing and collaboration -- Share, co-author, and manage documents directly within the communication platform. Integration with cloud storage (OneDrive, SharePoint) eliminates email attachments and version confusion.
- Contact center capabilities -- Advanced call routing, agent management, queue analytics, and CRM integration for customer-facing communication workflows.
UCaaS vs. On-Premises Unified Communications
| Factor | On-Premises UC | UCaaS (Cloud) |
|---|---|---|
| Infrastructure | Servers, PBX, SBCs on-site | Provider-managed cloud infrastructure |
| Cost model | High CapEx + ongoing OpEx | Predictable per-user subscription (OpEx) |
| Updates | Manual patching, planned downtime | Automatic, continuous updates |
| Scalability | Hardware-limited, weeks to expand | Instant scaling, add/remove users in minutes |
| Disaster recovery | Requires duplicate hardware at secondary site | Built-in geo-redundancy across data centers |
| Remote work | VPN required, degraded experience | Native from any internet connection |
Leading UCaaS Platforms
The UCaaS market is dominated by several major platforms, each with different strengths:
- Microsoft Teams -- The dominant UCaaS platform for enterprises, especially those already using Microsoft 365. Combines chat, meetings, calling (Teams Phone), and collaboration in a single application. Deepest integration with Microsoft ecosystem (SharePoint, OneDrive, Power Platform, Dynamics 365). Over 320 million monthly active users.
- Zoom Workplace -- Strong video meeting experience that expanded into chat, phone (Zoom Phone), and email. Popular in education and tech companies. Less enterprise integration than Teams but praised for video quality and ease of use.
- RingCentral -- A telephony-first UCaaS platform with strong voice features, global PSTN coverage, and contact center capabilities. Integrates with Microsoft Teams as a calling backend.
- Cisco Webex -- Enterprise-grade platform with strong security credentials, meeting room hardware ecosystem, and PSTN calling. Preferred by organizations with existing Cisco network infrastructure.
- 8x8 -- Combines UCaaS and CCaaS (Contact Center as a Service) in a single platform. Strong for organizations that need integrated employee and customer communication.
Enterprise Benefits of UCaaS
- Cost reduction -- Eliminates hardware procurement, server room maintenance, and the need for specialized telephony staff. Typical savings of 30-50% over on-premises UC when factoring in total cost of ownership over 5 years.
- Business continuity -- Cloud-based UCaaS is inherently resilient. Microsoft Teams operates across multiple Azure regions with automatic failover. Your communications continue even if your office loses power or internet.
- Workforce flexibility -- UCaaS enables remote, hybrid, and frontline workers to communicate and collaborate equally regardless of location. Mobile apps extend every UCaaS feature to smartphones and tablets.
- Faster innovation -- UCaaS providers ship new features continuously. Microsoft Teams releases major updates monthly. On-premises systems may go years between significant upgrades.
- Security and compliance -- Enterprise UCaaS platforms like Teams provide MFA, encryption at rest and in transit, DLP policies, compliance recording, eDiscovery, and regulatory certifications (HIPAA, SOC 2, FedRAMP, GDPR).
Why EPC Group for UCaaS Implementation
- Microsoft Teams specialization -- As a Microsoft Gold Partner, we are one of the most experienced Teams deployment partners in the US. We handle everything from licensing and tenant configuration to Teams Phone, meeting rooms, and contact center integration.
- Multi-vendor assessment -- We evaluate your needs objectively and recommend the right UCaaS platform. While we specialize in Teams, we advise on hybrid scenarios that combine Teams with third-party PSTN providers or contact center solutions.
- Compliance-first design -- We configure UCaaS environments that meet HIPAA, FedRAMP, SOC 2, and FINRA compliance requirements from day one.
- Network optimization -- We perform network assessments and optimize your LAN/WAN/SD-WAN for voice and video quality before deployment, preventing the call quality issues that derail UCaaS adoption.
- Change management -- Technology is only part of the equation. We drive user adoption through training programs, champion networks, and success metrics that ensure your UCaaS investment delivers real business value.
Ready to Move to UCaaS with Microsoft Teams?
EPC Group designs and deploys enterprise UCaaS solutions powered by Microsoft Teams. Voice, video, chat, and collaboration -- all unified in one platform with enterprise security and compliance.
Frequently Asked Questions
What is the difference between UCaaS and CCaaS?
UCaaS (Unified Communications as a Service) focuses on internal employee communication: calling, meetings, chat, and collaboration. CCaaS (Contact Center as a Service) focuses on external customer communication: inbound call routing, agent management, IVR, customer queues, and CRM integration. Many organizations need both. Some vendors (8x8, RingCentral) bundle them together; Microsoft offers Teams as UCaaS and partners with third-party CCaaS providers (or offers Queues app for basic scenarios).
Is UCaaS secure enough for regulated industries?
Yes, when properly configured. Microsoft Teams holds certifications for HIPAA, SOC 1/2/3, FedRAMP High, GDPR, ISO 27001, and dozens of other compliance frameworks. However, certification alone does not equal compliance -- you must configure the platform correctly (DLP policies, retention, encryption, access controls, compliance recording). EPC Group specializes in configuring UCaaS environments for regulated industries.
Can UCaaS replace our entire on-premises phone system?
In most cases, yes. Microsoft Teams Phone can replace traditional PBX systems with cloud-based calling that includes auto-attendants, call queues, voicemail, transfer, hold music, and call recording. The main exceptions are specialized analog devices (elevator phones, fire panels, paging systems) which require Analog Telephone Adapters, and organizations with regulatory requirements mandating on-premises telephony infrastructure. A telephony discovery assessment identifies any gaps before migration.
How reliable is UCaaS compared to traditional phone systems?
Enterprise UCaaS platforms like Microsoft Teams deliver 99.99% uptime SLAs, which is comparable to or better than most on-premises PBX systems. The key difference is the dependency model: traditional PBX depends on local hardware and power, while UCaaS depends on internet connectivity and the provider's cloud infrastructure. For maximum reliability, combine UCaaS with redundant internet connections and cellular failover for critical locations.
What internet bandwidth do I need for UCaaS?
Per user, VoIP calling requires approximately 100 kbps upload/download, video calling requires 1.5-4 Mbps, and screen sharing adds another 200-500 kbps. For a 100-person office where 30% might be on calls simultaneously, plan for approximately 50-100 Mbps dedicated to UCaaS traffic. Quality of Service (QoS) configuration is more important than raw bandwidth -- prioritize voice and video traffic over other internet usage to prevent call quality degradation during peak periods.