VoIP technology delivers voice information in digital form using circuit switching.

Question

BlackTom AI · Accepted Answer

VoIP uses packet switching over IP networks rather than traditional circuit switching, so the statement is false.

1) Relevant knowledge points and concepts
- Circuit switching: a dedicated end-to-end channel (like a traditional PSTN call) is established for the duration of the session; resources are reserved and not shared.  
- Packet switching: data is broken into packets that are routed independently over a shared network (the Internet); resources are used statistically and not permanently reserved.  
- VoIP (Voice over IP) pipeline: analog voice → codec (e.g., G.711, G.729) → digitization and packetization → transport via IP protocols (RTP over UDP; signaling via SIP/H.323). VoIP leverages packet switching across IP networks.

2) Step-by-step reasoning
- Voice is digitized by sampling and encoding (e.g., G.711 uses 8,000 samples/sec × 8 bits/sample → 64,000 bits/s). These digital samples are grouped into packets.  
- Packets are sent using IP routing; routers forward packets independently based on destination addresses. There is no permanently reserved channel between sender and receiver.  
- Real-time Transport Protocol (RTP) carries voice payloads, while SIP or H.323 handles call setup/teardown. These are all packet-switched mechanisms.

3) Intermediate calculation (example)
- G.711 PCM: sampling frequency = 8,000 Hz; bits per sample = 8; bandwidth = 8,000 × 8 = 64,000 bits/s (64 kbps) per voice stream before packet/header overhead. This illustrates digitization but not circuit establishment.

4) Why the correct answer is correct
- The defining characteristic of VoIP is that digitized voice is encapsulated into packets and transmitted over IP networks using packet switching. That is fundamentally different from circuit switching.

5) Why the other option is incorrect
- Saying "True" would assert VoIP uses circuit switching; that ignores the packetization, routing, and protocols (RTP/SIP) that make VoIP a packet-switched technology. Although a VoIP call may interface with the PSTN (which uses circuit switching) via a gateway, the VoIP portion itself uses packet switching.

6) Conclusion
- Therefore the correct answer is False, which matches the provided answer.

VoIP technology delivers voice information in digital form using circuit switching. 判断题

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