Definition
The Public Switched Telephone Network (PSTN) is the traditional, worldwide circuit-switched telephone network. Voice AI platforms bridge internet-based calling to the PSTN so agents can reach ordinary phones.
Why it matters
Connecting to the PSTN is what allows an AI agent to call or receive calls from any standard phone number.
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Understanding the terminology is the first step. Launching a branded voice AI practice is the next. Fusion Calling helps agencies go live in about 7 days, with multi-provider support, done-with-you onboarding, and full brand ownership.
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