3Dialing methodsDialing methodsThe MCA provides three methods for making data calls through the NortelNetworks PBX: keyboard dialing, AT dialing, and keypad dialing. You useKeyboard and AT dialing by entering commands at a terminal or on a PC runningsoftware to make it emulate a terminal. Keypad dialing is done through thetelephone keypad.Keyboard dialing is menu driven. Data calls are made by pressing the < CR > toget the Main menu. By navigating through the menus, different features can beactivated.AT dialing is very similar to methods used to make modem calls with a HayesSmartmodem 1. The user enters a command starting with the letters AT followed bya few letters to distinguish the command, then presses the carriage return < CR >Key.Keypad dialing on the M3900 telephone is done by pressing the Options Keyfollowed by a two digit MCA data parameters number. To release the keypadtelephone dialing, press the Options Key.Switching between keyboard and AT dialingTo switch between AT dialing and keyboard dialing, you must be in an idle state(not connected to a far end data device).The most recent prompt must beeither:NO CARRIERorRELEASEDTo switch to AT dialing:ATorAt this point you may type AT to get ATdialingor< CR > Press the Carriage Return Key to activatekeyboard dialing.1.Smartmodem is a trademark of Hayes Microcomputer Products Inc.