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app_softmodem.c - V.21/V.22/V.23 modem for Asterisk =============================================================================== This Asterisk application provides a softmodem for Asterisk. It supports the FSK standards V.23, V.21 and Bell 103, but also V.22 and V.22bis. Byte-size, number of stopbits and bitordering is configurable. A TCP connection comparable to a Telnet session is established to the host specified. Dependencies and Installation ------------------------------------------------------------------------------- app_softmodem.c depends on the spandsp library (http://www.soft-switch.org/). It is tested and working with Asterisk 13t. To compile put app_softmodem.c in the apps/ dir of your Asterisk source. Compile with 'make apps'. To use do a 'make install' on your asterisk source or copy apps/app_softmodem.so into your asterisk module directory (/lib/asterisk/mosules). Dialplan ------------------------------------------------------------------------------- exten => btx,1,Answer() exten => btx,n,Softmodem(host, port, options) exten => btx,n,Hangup() Without any arguments the application acts as a V.23 modem and connects to a Telnet server (port 23) on localhost. Options are: r(...): rx cutoff (dBi, float, default: -35) t(...): tx power (dBi, float, default: -28) v(...): modem version (default: V23): V21 - 300/300 baud V23 - 1200/75 baud Bell103 - 300/300 baud V22 - 1200/1200 baud V22bis - 2400/2400 baud l or m: least or most significant bit first (default: m) d(...): amount of data bits (5-8, default: 8) s(...): amount of stop bits (1-2, default: 1) e or o: add even or odd parity bit u: Send Ulm Relay Protocol header to Telnet server n: Send NULL-Byte to modem after carrier detection (Btx specific) To act as a "Btx Vermittlungsstelle" (German videotex system) using V.23, 8 data bits, 1 stop bit and sending a NULL byte upon carrier detection and connecting to a "twistedUlm" server on port 8289 (thus sending the ULM header): exten => 190,1,Softmodem(localhost, 8289, v(V23)ld(8)s(1)un) To accept calls fom UK Prestel terminals, using V.23, 7 data bits, Even parity, 1 stop bit - exten => 618,n,Softmodem(localhost, 6502, v(V23),ld(7)es(1)t(-8)) The modem seems to work fine with VOIP as long as you use a codec like G.711 (alaw/ulaw). Please deactivate any echo cancellation you might use. Btx, the Ulm Relay Protocol, general description of operation ------------------------------------------------------------------------------- After the softmodem picks up the line a TCP connection to the specified host and port is established, the call is dropped when this wasn't successfull. When the "n" option is specified a NULL byte is send to the caller upon the detection of a carrier signal from the caller. The Btx system in Germany did this to request the caller's identification. With the "u" option specified a header is send to the TCP server at this point. The header consists of some "name: value" pairs, separated by a CR+LF newline, terminated by a double newline. At the moment this header looks like (for V.23): Version: 1 TXspeed: 120 RXspeed: 7.5 Speeds are in bytes-per-second and may be used by the server to estimate the length of the transmission. After the header all data received from the terminal is put onto the socket and all data received from the socket is put on the line. The line is hung up when the server drops the connection, just as the connection to the server is dropped when the line is hung up. You find my "Ulm Relay Protocol" server here: http://github.com/proquar/twistedUlm It sends CEPT T/CD 6-1 encoded data, which it retrieves from a webserver, to the terminal and provides the characteristic BTX look-and-feel. You may also be interested in: http://runningserver.com/?page=runningserver.content.thelab.bildschirmtrix And you find a description of BTX MarkupLanguage here: http://runningserver.com/?page=runningserver.content.thelab.mikropad Authors ------------------------------------------------------------------------------- Christian Groeger <email@example.com> Based on code by: Dmitry Andrianov <firstname.lastname@example.org> Steve Underwood <email@example.com> =============================================================================== GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. 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