The first analog line port in any system can be used for V32 modem access. The line is switched between modem operation and normal voice call operation by dialing *9000* or through the Modem Enabled option shown in the trunk's advanced setup settings. When operating as a modem, the line cannot be used for normal voice calls.
The modem functionality can also be accessed as extension 76. This can be used as the destination in an auto attendant menu in the DID mapping/SIP Call-by-Call tables of trunks. This allows remote access on lines other than the first analog line. This method can be used without first having to use the Modem Enabled option.