Virtual Private Dial-Up Network (VPDN)
Definition - What does Virtual Private Dial-Up Network (VPDN) mean?
A virtual private dial-up network (VPDN) is a type of VPN that provides remote access services and capabilities to private networks' dial-in service in addition to a shared infrastructure. It is a network mechanism for connecting remote and long-distance dial-in users with corporate or enterprise networks using a combination of PSTN and IP networking.
Techopedia explains Virtual Private Dial-Up Network (VPDN)
VPDN uses Layer 2 tunneling technology, such as L2F and L2TP, to enable Layer 2 and parts of a network from a user to be connected to the ISP and the private network.