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Can VoIP make and receive calls to/from PSTN lines?
Yes, but this requires a device called an IP to PSTN gateway. When you get service from an Internet Telephony Service Provider (ITSP) and use an IP phone to make a call to someone on the PSTN, the call is routed through the IP network until it reaches a gateway that converts from IP to a PSTN interface (e.g., analog, BRI, T1, or E1). If someone on the PSTN tries to dial someone on the IP network, the opposite happens.