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

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.

Frequently Asked Questions