Can VoIP make and receive calls to/from PSTN lines?
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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.
This was first published in March 2005