What Is Skype VoIP and Who Is It For?
Skype VoIP (Voice over Internet Protocol) is Microsoft's consumer and small business voice calling service that transmits phone calls over the internet instead of traditional telephone lines. While Skype pioneered mainstream VoIP adoption when it launched in 2003, Microsoft has officially retired Skype as of May 2025 and migrated all users to Microsoft Teams. For enterprise organizations, this transition is significant: if your business still relies on Skype for any voice communications, the time to migrate to Microsoft Teams is now. At EPC Group, we have guided hundreds of organizations through Skype-to-Teams migrations, ensuring zero disruption to business communications.
How Skype VoIP Technology Worked
Understanding Skype's VoIP technology provides context for why Microsoft Teams is a superior successor and what capabilities to expect from modern VoIP:
- Peer-to-peer architecture (original) -- Skype originally used a peer-to-peer network where calls were routed through other Skype users' computers. This reduced infrastructure costs but created quality inconsistencies.
- Cloud-based architecture (later) -- Microsoft migrated Skype to cloud-based supernodes hosted in Microsoft data centers, improving reliability and call quality significantly.
- Codec technology -- Skype used the SILK codec (developed by Skype) for voice and VP8 for video, providing high-quality audio at relatively low bandwidth (6-40 kbps for voice).
- PSTN gateway -- Skype's "Skype Out" and later "Skype Credit" services connected VoIP calls to the traditional phone network, allowing Skype users to call landlines and mobile phones worldwide at reduced rates.
Who Used Skype VoIP?
Skype served several distinct user segments before its retirement:
- Consumer users -- Individuals and families using Skype for free voice and video calls to other Skype users, popular for international calling to friends and family.
- Small businesses -- Companies that used Skype as an informal conferencing and calling tool before adopting enterprise-grade solutions. Skype for Business (the enterprise product) was a separate application.
- Remote workers and freelancers -- Before Zoom and Teams, Skype was the default tool for remote meetings, client calls, and virtual interviews.
- International businesses -- Organizations with global operations used Skype Credit to make affordable international calls, bypassing expensive traditional carrier rates.
The Transition to Microsoft Teams
Microsoft has consolidated all its communication tools into Microsoft Teams:
- Skype consumer retired (May 2025) -- Microsoft officially shut down Skype consumer in May 2025. All contacts, chat history, and Skype Credit balances were migrated to Microsoft Teams (free version) for consumer users.
- Skype for Business Online retired (July 2021) -- The enterprise version of Skype was retired in 2021, with all enterprise users migrated to Microsoft Teams. On-premises Skype for Business Server continues to receive extended support but no new features.
- Microsoft Teams: The successor -- Teams provides everything Skype offered plus significantly more: persistent chat, channel-based collaboration, file sharing, app integration, enterprise phone system (Teams Phone), meeting rooms, and AI-powered features (Copilot, live captions, meeting recaps).
Microsoft Teams VoIP vs. Skype VoIP
| Capability | Skype VoIP | Microsoft Teams |
|---|---|---|
| VoIP calling | Skype-to-Skype free | Teams-to-Teams free, plus PSTN options |
| External PSTN calling | Skype Credit (pay-as-you-go) | Calling Plans, Direct Routing, Operator Connect |
| Enterprise phone system | Not available in consumer Skype | Full PBX replacement with auto-attendants and queues |
| Meeting capacity | Up to 100 participants | Up to 1,000 (10,000 with Town Hall) |
| Security | Basic encryption | Enterprise-grade (MFA, DLP, compliance recording) |
| AI features | None | Copilot, live captions, transcription, meeting recap |
Migration Planning for Remaining Skype Users
If your organization still has users on Skype (consumer or Skype for Business Server on-premises), here is what you need to plan:
- Inventory current usage -- Document all Skype users, their calling patterns (internal, external, international), any Skype credit balances, and integrations with other systems.
- License planning -- Determine which Microsoft 365 licenses are needed. Teams is included in Microsoft 365 Business Basic, E3, and E5. Teams Phone requires an add-on license unless you have E5.
- User training -- While Teams shares some UX patterns with Skype, the expanded feature set requires training. Focus on calling, meetings, chat, and channel collaboration workflows.
- Contact migration -- Skype contacts can be migrated to Teams. For Skype for Business Server, Microsoft provides coexistence modes during the transition period.
Why EPC Group for Skype-to-Teams Migration
- Hundreds of migrations completed -- We have migrated organizations from Skype for Business (both Online and Server) to Microsoft Teams with zero downtime and full feature parity.
- Coexistence expertise -- For complex migrations, we configure Teams/Skype coexistence modes that allow a phased transition while maintaining communication between both platforms.
- PSTN connectivity -- We design and deploy the right PSTN solution (Calling Plans, Direct Routing, or Operator Connect) based on your calling patterns, geographic footprint, and budget.
- Change management -- We provide user training, adoption campaigns, and champion programs to ensure your organization actually uses Teams effectively, not just installs it.
Still on Skype? Time to Migrate to Teams.
With Skype officially retired, EPC Group can fast-track your migration to Microsoft Teams with full VoIP, PSTN connectivity, and enterprise collaboration features. Contact us for a migration assessment.
Frequently Asked Questions
Is Skype still available?
What happened to my Skype contacts and chat history?
Is Microsoft Teams free like Skype was?
Can Teams make phone calls to regular phone numbers like Skype could?
How long does a Skype to Teams migration take?
Microsoft Strategy: 2026 Considerations for What Is Skype Voip And Who Is It For
Microsoft Solutions Partner status (six designations: Data and AI, Modern Work, Infrastructure, Security, Digital and App Innovation, Business Applications) replaced the legacy Microsoft Gold Partner program in 2022. EPC Group held Gold Partner status from 2003 to 2022 (the oldest continuous Gold Partner in North America) and currently holds all six Solutions Partner designations; a credentialing footprint shared by fewer than 50 firms globally and typically used by Microsoft field teams as a vetting gate for enterprise Customer 0 nominations and named-account engagements.
EPC Group 29-year Microsoft consulting heritage matters specifically because Microsoft platform decisions today are layered on top of 25 years of architectural choices: Active Directory schema decisions from 2005 affect Microsoft Entra ID Conditional Access policy design in 2026; SharePoint 2003 information architecture decisions affect Copilot grounding quality in 2026. The firms that can navigate that depth (fewer than a dozen Microsoft Solutions Partners in North America) have a structural advantage on enterprise Microsoft migrations.
Decision factors EPC Group evaluates
- Cost optimization and licensing audit
- Microsoft platform capability assessment
- Vendor consolidation analysis
- Compliance and governance posture review
- Enterprise architecture roadmap
EPC Group covers this topic across the relevant engagement portfolio. Reach the firm at contact@epcgroup.net for a 30-minute architect conversation.
What Is Skype Voip and Who Is It for delivered by senior Microsoft architects
This What Is Skype Voip and Who Is It for explainer is part of EPC Group's practitioner library. The audience is enterprise IT, compliance, and architecture leaders evaluating Microsoft technology choices for Fortune 500 and regulated-industry environments. Content reflects real production experience, not vendor marketing.
EPC Group ships What Is Skype Voip and Who Is It for as part of broader Microsoft 365, SharePoint, Power BI, Azure, and Microsoft Copilot engagements. The decision criteria, deployment patterns, and governance considerations covered here come directly from senior architect playbooks honed across 11,000-plus enterprise engagements.
Fixed-fee accelerators with real scope
Predictable scope, predictable price, predictable outcome. Copilot Readiness, Security Hardening, Tenant Health Check, SharePoint Migration, and Teams Governance ship as defined accelerators where Big 4 firms quote open-ended time-and-materials. Most projects land in the $25K-$150K range for accelerators or $150K-$750K for full programs.
How EPC Group engages
Six-phase methodology applied to every engagement, compressed for fixed-fee accelerators and extended for full programs.
- Discovery — two-week assessment of the current estate, gap analysis, risk register, target architecture, costed remediation roadmap.
- Design — senior architect produces the target topology, identity framework, Conditional Access, Purview, governance model, and security posture, reviewed by client leads.
- Pilot — 25 to 100 user pilot in a real business unit. Migrate, apply baselines, test integrations, capture feedback.
- Wave rollout — migrate in waves of 500 to 2,500 users with communications, training, hypercare, and a per-wave retrospective.
- Adoption — role-based training, Champions network, executive sponsor enablement, metrics tracked against a measured baseline.
- Operate — optional managed-services retainer for license optimization, governance reviews, security monitoring, and quarterly business reviews.
Government and defense contractors
For federal agencies and CMMC-regulated suppliers, EPC Group delivers FedRAMP Moderate and High posture, GCC and GCC High tenants, CUI handling, and ITAR-controlled data segregation. Errin O'Connor (CEO and founder) is a contributor to the FedRAMP framework; that direct authorship shows up in how we architect Conditional Access for government endpoints.
Healthcare and life sciences
For hospitals, payors, and pharmaceutical companies, EPC Group enforces HIPAA, business associate agreements, and Microsoft Purview sensitivity labels for protected health information. Epic and Cerner integration patterns are part of our regulated-industry library, alongside 21 CFR Part 11 e-signature controls for clinical trials and validated SharePoint document workflows for life-sciences manufacturing.
Microsoft-only since 1997
29 years of Microsoft-exclusive consulting. Microsoft Solutions Partner with core designations across Modern Work, Security, and Data & AI.
EPC Group was the oldest continuous Microsoft Gold Partner in North America from 2016 until program retirement in 2022. Errin O'Connor authored four Microsoft Press bestsellers covering Power BI, SharePoint, Azure, and large-scale migrations.
Engagement models
Three engagement models cover most enterprise needs. Most clients start with a fixed-fee accelerator and grow into a full program or a managed-services retainer.
- Fixed-fee accelerators — Copilot Readiness, Security Hardening, Tenant Health Check, SharePoint Migration, Teams Governance. Defined scope and price. Typical range $25,000 to $150,000 over four to twelve weeks.
- Project engagements — full migration or governance program with milestone-based billing. Discovery through hypercare. Typical range $150,000 to $750,000-plus over three to nine months.
- Managed services — tiered retainer for ongoing operations. Named senior architect on the account. From $3,500 per month with a twelve-month minimum.
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