Networking
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Explain Why Voice Calls Use UDP
In 40 seconds you will explain why WhatsApp calls prefer UDP.
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Lesson notes
Tell TCP from UDP and explain ports, three-way handshake and reliability
Key points
- TCP retransmits lost segments and waits for them, which is perfect for downloading a lecture PDF but adds delay to live audio.
- On a live call or a Black Stars stream, a late packet is useless, so UDP simply skips it and keeps the conversation moving.
Takeaway: For real-time apps, on time beats complete.
Quick check: Why is UDP preferred over TCP for a live VoIP call?
- It encrypts audio
- Avoiding resend delay
- It guarantees order
Waiting for retransmitted audio adds lag, so UDP skips lost packets instead.
port numberthree-way handshakeflow controlcongestion controlRetransmissionReal-time
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