PSTN
The traditional public switched telephone network, based on circuit-switching technology, which provides voice call services.
Timeline (last 90 days)
The core characteristic of circuit switching is that a dedicated end-to-end physical or logical path must be established before a call, and released only after the call ends.
Platforms like Retell add a conversation orchestration layer on top of the ASR, LLM, and TTS modules, responsible for managing state machines, invoking external tools, handling interruption logic, and managing integration with PSTN or VoIP.
For an AI agent to dial an ordinary phone number, data packets must ultimately be converted into circuit-switched signals via a PSTN gateway before reaching the other party.
All Facts (3)
The core characteristic of circuit switching is that a dedicated end-to-end physical or logical path must be established before a call, and released only after the call ends.
50%UnverifiedPlatforms like Retell add a conversation orchestration layer on top of the ASR, LLM, and TTS modules, responsible for managing state machines, invoking external tools, handling interruption logic, and managing integration with PSTN or VoIP.
50%UnverifiedFor an AI agent to dial an ordinary phone number, data packets must ultimately be converted into circuit-switched signals via a PSTN gateway before reaching the other party.
50%