--- name: "cui" section: "4" platform: "linux" package: "isdnutils" version: "2.0-7" release: "Debian 1.3 (Bo)" platforms: ["linux"] url: "https://new.carta.tech/ttyI" --- # cui(4) ISDN character devices Part of [ttyI(4)](/ttyI/4.md). ## NAME ttyI, cui - ISDN character devices\ ## DESCRIPTION *ttyIx and cuix* are the character devices of the isdn4linux ISND driver package. They can be used in the same way as the traditional serial devices *ttySx* and *cuax.* The official major device numbers are *43* for ttyI and *44* for cui. The minor device numbers start with *0* and end with *63.* The ISDN devices provide a modem emulation with a set of traditional and some special AT commands. This provides easy use together with almost all communication software that uses modem commands: *minicom* (1), *seyon* (1), *XCept* (1), *uucico* (8) (Taylor UUCP), *mgetty* (8), *dip* (8), *pppd* (8) and more. The line disciplines are handled by the kernel so that SLIP, CSLIP and asynchronous PPP are possible. The port speed of the *ttyIx* and *cuix* devices is always 64000 bps. ## AT COMMAND SET The following *AT commands* are supported by *ttyIx* and *cuix.* - **ATA** Answer an incoming call. - **ATD \** Dial number \. Allowed are digits \[0-9\] and the characters ",", "#", ".", "\*", "W", "P", "T", "S", "-". The characters are ignored except of "S" which indicates a SPV if it preceedes the number (**only** German 1TR6 ISDN). - **ATE0** Echo off. - **ATE1** Echo on (default). - **ATH** Hang up. - **ATH0** Hang up. - **ATH1** Off hook (ignored). - **ATI** Return device Information ("ISDN for Linux..."). - **ATI0** Return device Information ("ISDN for Linux..."). - **ATI1** Return device Information ("ISDN for Linux..."). - **ATO** Return from command mode to online mode (data mode). - **ATQ0** Enable result codes (default). - **ATQ1** Disable result codes. - **ATSx=y** Set register x to value y. - **ATSx?** Show content of register x. - **ATV0** Print result code as number. - **ATV1** Print result code as text (default). - **ATZ** Reset all registers and load profile values. - **AT&Bx** Set packet size of outgoing packets to value x (maximum 4000). The actual packet size depends on the hardware driver and may be smaller than the given value x (e.g. with the teles driver). There will be **no** error message if the value is bigger than the hardware driver can process. However the size of the outgoing packets will be set correctly. - **AT&D2** DTR falling edge: hang up and return to command mode (default). - **AT&D3** DTR falling edge: hang up, return to command mode and reset all registers. - **AT&Ex** Set MSN (Euro-ISDN, E-DSS1) or EAZ (German 1TR6) to value x. For MSNs set x to the whole MSN, for EAZ's x should be only the last digit of the Number. - **AT&F** Set all registers and profile to "factory-defaults". - **AT&V** Show all settings. - **AT&W0** Write registers and EAZ/MSN to profile. (You need to run *iprofd* (8) for making changes permanent.) - **AT&Xx** Enable (x=1) or disable (x=0) BTX-Mode. ## ESCAPE SEQUENCE During a connection the driver can be set to command mode while typing in The escape character (default "+") may be set via register 2. The delay must be at least 1.5 seconds, between each escape character the pause must not exceed 0.5 seconds. *ATO* brings the modem emulation back to data mode. ## REGISTERS - **0** Number of rings on which the "modem" will answer. (S0=0 will disable auto answering). (Default 0). - **1** Counts and stores the number of rings from an incoming call. - **2** ASCII code of the escape character. (Default 43 = "+"). - **3** ASCII code of Carriage Return (Default 13 = CR). - **4** ASCII code of Line Feed (Default 10 = LF). - **5** ASCII code of Backspace (Default 8 = BS). - **6** Duration, in number of seconds, modem waits before dialing. (Default 3). - **7** Wait time for carrier in seconds (ignored, default 60). - **8** Pause time for comma (,) in dial command in seconds (ignored, default 2). - **9** Carrier detect time in tenths of seconds (ignored, default 6). - **10** Wait time until hangup after carrier loss in tenths of seconds (ignored, default 7). - **11** Duration and delay in milliseconds for touch tone dialing (ignored, default 70). - **12** Bit-mapped register (default 69)\ Bit Description 0 0 = Suppress response messages.\ 1 = Show response messages. 1 0 = Response messages as text.\ 1 = Numeric response messages. 2 0 = Echo off.\ 1 = Echo on. 3 0 = DCD always on.\ 1 = DCD follows carrier. 4 0 = CTS follows RTS.\ 1 = Ignore RTS, CTS always on. 5 0 = Low-edge on DTR: Hangup and return to command mode.\ 1 = Same as 0 but also resets all registers. 6 0 = DSR always on.\ 1 = DSR on only if channel is available. 7 0 = Cisco-PPP-flag-hack off (default).\ 1 = Cisco-PPP-flag-hack on. - **13** Bit-mapped register (default 0)\ Bit Description 0 0 = Use delayed sending of data.\ 1 = Immediately send data. 1 0 = T.70 protocol off.\ 1 = T.70 protocol on. - **14** Layer-2 protocol\ 0 = X75/LAPB with I-frames (default)\ 1 = X75/LAPB with UI-frames\ 2 = X75/LAPB with BUI-frames\ 3 = HDLC - **15** Layer-3 protocol 0 = transparent (default) - **16** Outgoing packet size / 16 (default 250). - **17** reserved. - **18** Service-Octet-1. - **19** Service-Octet-2. ## BUGS This man page is not complete. ## AUTHOR Volker Goetz \ ## SEE ALSO *icnctrl* (8), *telesctrl* (8), *isdninfo* (4), *isdnctrl* (8).