What is PSTN (public switched telephone network)?
The worldwide network of ordinary phone lines and mobile networks that phone calls travel over.
PSTN (public switched telephone network), explained
When a voice agent calls a mobile number, the call leaves the internet and travels over the PSTN.
PSTN audio is narrowband, which is why speech recognition for phone calls needs models built for telephone audio.
Mobile network quality varies across India, so phone audio can drop or break up. Voice agents for Indian callers need to handle unclear audio gracefully, for example by politely asking the caller to repeat.
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