International calling glossary

Clear definitions of terms you will encounter in international calling. No jargon, no fluff.

• VoIP — Voice over Internet Protocol
• WebRTC — Web Real-Time Communication
• Per-minute billing
• Calling prefix
• Destination prefix
• PSTN — Public Switched Telephone Network
• Calling card
• International calling
• Pay-as-you-go calling
• Caller ID
• DTMF — Dual-Tone Multi-Frequency