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diff --git a/Documentation/isdn/README.audio b/Documentation/isdn/README.audio deleted file mode 100644 index 8ebca19290d9..000000000000 --- a/Documentation/isdn/README.audio +++ /dev/null @@ -1,138 +0,0 @@ -$Id: README.audio,v 1.8 1999/07/11 17:17:29 armin Exp $ - -ISDN subsystem for Linux. - Description of audio mode. - -When enabled during kernel configuration, the tty emulator of the ISDN -subsystem is capable of a reduced set of commands to support audio. -This document describes the commands supported and the format of -audio data. - -Commands for enabling/disabling audio mode: - - AT+FCLASS=8 Enable audio mode. - This affects the following registers: - S18: Bits 0 and 2 are set. - S16: Set to 48 and any further change to - larger values is blocked. - AT+FCLASS=0 Disable audio mode. - Register 18 is set to 4. - AT+FCLASS=? Show possible modes. - AT+FCLASS? Report current mode (0 or 8). - -Commands supported in audio mode: - -All audio mode commands have one of the following forms: - - AT+Vxx? Show current setting. - AT+Vxx=? Show possible settings. - AT+Vxx=v Set simple parameter. - AT+Vxx=v,v ... Set complex parameter. - -where xx is a two-character code and v are alphanumerical parameters. -The following commands are supported: - - AT+VNH=x Auto hangup setting. NO EFFECT, supported - for compatibility only. - AT+VNH? Always reporting "1" - AT+VNH=? Always reporting "1" - - AT+VIP Reset all audio parameters. - - AT+VLS=x Line select. x is one of the following: - 0 = No device. - 2 = Phone line. - AT+VLS=? Always reporting "0,2" - AT+VLS? Show current line. - - AT+VRX Start recording. Emulator responds with - CONNECT and starts sending audio data to - the application. See below for data format - - AT+VSD=x,y Set silence-detection parameters. - Possible parameters: - x = 0 ... 31 sensitivity threshold level. - (default 0 , deactivated) - y = 0 ... 255 range of interval in units - of 0.1 second. (default 70) - AT+VSD=? Report possible parameters. - AT+VSD? Show current parameters. - - AT+VDD=x,y Set DTMF-detection parameters. - Only possible if online and during this connection. - Possible parameters: - x = 0 ... 15 sensitivity threshold level. - (default 0 , I4L soft-decode) - (1-15 soft-decode off, hardware on) - y = 0 ... 255 tone duration in units of 5ms. - Not for I4L soft decode (default 8, 40ms) - AT+VDD=? Report possible parameters. - AT+VDD? Show current parameters. - - AT+VSM=x Select audio data format. - Possible parameters: - 2 = ADPCM-2 - 3 = ADPCM-3 - 4 = ADPCM-4 - 5 = aLAW - 6 = uLAW - AT+VSM=? Show possible audio formats. - - AT+VTX Start audio playback. Emulator responds - with CONNECT and starts sending audio data - received from the application via phone line. -General behavior and description of data formats/protocol. - when a connection is made: - - On incoming calls, if the application responds to a RING - with ATA, depending on the calling service, the emulator - responds with either CONNECT (data call) or VCON (voice call). - - On outgoing voice calls, the emulator responds with VCON - upon connection setup. - - Audio recording. - - When receiving audio data, a kind of bisync protocol is used. - Upon AT+VRX command, the emulator responds with CONNECT, and - starts sending audio data to the application. There are several - escape sequences defined, all using DLE (0x10) as Escape char: - - <DLE><ETX> End of audio data. (i.e. caused by a - hangup of the remote side) Emulator stops - recording, responding with VCON. - <DLE><DC4> Abort recording, (send by appl.) Emulator - stops recording, sends DLE,ETX. - <DLE><DLE> Escape sequence for DLE in data stream. - <DLE>0 Touchtone "0" received. - ... - <DLE>9 Touchtone "9" received. - <DLE># Touchtone "#" received. - <DLE>* Touchtone "*" received. - <DLE>A Touchtone "A" received. - <DLE>B Touchtone "B" received. - <DLE>C Touchtone "C" received. - <DLE>D Touchtone "D" received. - - <DLE>q quiet. Silence detected after non-silence. - <DLE>s silence. Silence detected from the - start of recording. - - Currently unsupported DLE sequences: - - <DLE>c FAX calling tone received. - <DLE>b busy tone received. - - Audio playback. - - When sending audio data, upon AT+VTX command, emulator responds with - CONNECT, and starts transferring data from application to the phone line. - The same DLE sequences apply to this mode. - - Full-Duplex-Audio: - - When _both_ commands for recording and playback are given in _one_ - AT-command-line (i.e.: "AT+VTX+VRX"), full-duplex-mode is selected. - In this mode, the only way to stop recording is sending <DLE><DC4> - and the only way to stop playback is to send <DLE><ETX>. - |