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How do I get ISDN on server to accept incoming calls from remote users with 56k modems?

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 POTS (plain old telephone service) modems. You must have a POTS modem bank on your remote access server to accept incoming POTS calls.

Dig Deeper on Windows Server troubleshooting

Learning Path: Telephony and Wide Area Networks TELEPHONY AND WIDE AREA NETWORKS...circuit - PSTN - Plain Old Telephone Service (POTS) - telephone jacks - dial-up - acoustic coupler - modem - 56flex - 56 Kbps (x2) - handshaking - V.xx standards - local loop - central office - LIDB - dedicated line - BOC - RBOC - Intelligent Network (IN) - Advanced Intelligent Network (AIN) - Signaling System 7 (SS7) - EWSD - erlang (measure of line usage) - frame - frame relay - frame relay access device (FRAD) - ATM - 2600 - ISDN - B-channel - D-channel - terminal adapter - BISDN - HDLC - IDSL - PABX - Direct Inward Dialing (DID) - Automatic Number Identification (ANI) - Dialed Number Identification Service (DNIS) - permanent virtual circuit (PVC) - switched virtual circuit - DSLAM - Voice over IP - VoxML - CAPI - TAPI - splitter - splitterless (DSL) - ATU-R - digital loop carrier View other topics for self-study by visiting our Guide to the Learning Paths.

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