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How do you set up a ISDN modem on a server to accept incoming calls from remote users using laptops with 56k modems? I have been able to set up the ISDN to dial out and connect to other servers using VPN, but not for remote users to dial in to this server.
It is not possible for an ISDN modem to accept incoming calls from
(plain old telephone service) modems. You must have a POTS modem bank on your remote access server to accept incoming POTS calls.