(CAPI*) chan_capi a Common ISDN API 2.0 implementation for Asterisk/OpenPBX Copyright (C) 2005-2006 Cytronics & Melware Armin Schindler Reworked, but based on the work of Copyright (C) 2002-2005 Junghanns.NET GmbH Klaus-Peter Junghanns Ported to OpenPBX.org 22nd October 2004, Rob Thomas, This program is free software and may be modified and distributed under the terms of the GNU Public License. There is _NO_ warranty for this! Thanks go to the debuggers, bugfixers and contributors :) =========================================================================== Lele Forzani Florian Overkamp Gareth Watts Jeff Noxon Petr Michalek Jan Stocker Frank Sautter, levigo group Hans Petter Selasky (...and all the others that have been forgotten...) :-) No support for Asterisk 1.0.x any more, you need at least Asterisk 1.2.x To support all fax features (e.g. fax polling), you need version 3 of libcapi20. This chan_capi version includes: ================================ - Multiple controller support - CID,DNID (callling party, called party) - CLIR/CLIP - Supplementary services: CD (deflect/reroute),HOLD,RETRIEVE,ECT - DTMF (dependend on card) + software DTMF support - Early B3 connects (always,success,never) - Digital audio (what did you think?) - Incoming/outgoing calls - Overlap sending (dialtone and additional digits) - E(xplicit) C(all) T(ransfer) (...although it's done implicit-but don't tell!) - Use asterisks internal DSP functions for DTMF - Alaw support - Ulaw support! - Eicon CAPI echo cancelation (echocancel=1) - Reject call waiting (ACO) - DID for Point to Point mode (a.k.a overlap receiving) - Rx/Tx gains (rxgain=1.0) - (Inter)national dialing prefix (for callerid) configurable in capi.conf - CLI command "capi info" shows B channel status of chan_capi - Catch all MSN (incomingmsn=*) - Some configuration enhancements (msn=123,124,125) - Added accountcode= - Echo squelching (echosquelch=1) - Callgroup support - report correct DIALSTATUS and HANGUPCAUSE. - Updated to support the new frame->delivery field - Compiles with different Asterisk versions (automatic build configuration) - receive/send faxes over CAPI (see below) - Fixes and compatibility for BSD (Jan Stocker and Hans Petter Selasky) - Support 'type of number'. - ISDN hold. - CAPI Line Interconnect. - Eicon DIVA Server VoIP/RTP - CLI command "capi show channels" shows details on channel status. Permissions =========== OpenPBX.org, by default, runs as the non-root user/group openpbx/openpbx. You must make sure that the /dev/capi* device files are readable by OpenPBX.org either by changing the ownership or the permissions of the the device files or by running OpenPBX.org as root. The Dial string =============== Example: Dial(CAPI/g/[:][/]) Or: Dial(CAPI/contr/[:][/]) Or: Dial(CAPI//[:][/]) 'group' can be a value, comma separated list of values or a range using '-'. The according interface is found by searching a match with the 'group' specified in the capi.conf for each interface. The optional followed by an ':' can be used to set a callerid for this dial() command, without changing the original channel's callerid. 'params' is an optional part to set special settings for this call. The string consists of a list of characters with the following meaning: 'b' : early B3 always. 'B' : early B3 on successful calls only. 'd' : use the default caller id which is set by defaultcid= in capi.conf 'o' : use overlap sending of number. (Useful if additional digits shall be send afterwards or together with 'b' to get dialtone and then send the number, e.g. if otherwise no progress tones are available) If the is used in dialstring, be sure the name (specified in capi.conf) does not start with 'contr' or 'g'. CLIP/CLIR uses the calling presentation of the calling channel, which can be modified using the SetCallerPres() application. Use SetCallerPres(prohib_not_screened) for CLIR. That is why the msn= param in capi.conf has been removed. The callerID is also taken from the calling channel. CAPI command application ======================== chan_capi provides an additional Asterisk application capicommand() With this application, special capi commands and features can be used. Call Deflection: Forwards an unanswered call to another number. Example: exten => s,1,capicommand(deflect|12345678) Fax receive: Receive a fax using CAPI. Example: exten => s,1,capicommand(receivefax|/tmp/${UNIQUEID}|+49 6137 555123|Asterisk) (more see below) Fax send: Send a fax using CAPI. Example: exten => s,1,capicommand(sendfax|/path/to/faxfile.sff|+49 6137 555123|Asterisk) (more see below) Enable/Disable echosquelch: Enable or disable a very primitive echo suppressor. Disable this before you start recording voicemail or your files may get choppy. Example: exten => s,1,capicommand(echosquelch|yes) or exten => s,1,capicommand(echosquelch|no) Enable/Disable echocancel: Enable or disable echo-cancel provided by CAPI driver/hardware. You may need to disable echo-cancel when e.g. data/fax transmission handled by non-CAPI application. Example: exten => s,1,capicommand(echocancel|yes) or exten => s,1,capicommand(echocancel|no) Malicious Call Identification: Report a call of malicious nature. Example: exten => s,1,capicommand(malicious) Hold: Puts an answered call on hold, this has nothing to do with asterisk's onhold thingie (music et al). An optional parameter is the name of the variable which shall be set with the reference ID of the call on hold. Example: exten => s,1,capicommand(hold) or exten => s,1,capicommand(hold|MYHOLDVAR) Holdtype: Set the type of 'hold'. When Asterisk wants to put the call on hold, the specified method will be used. Example: exten => s,1,capicommand(holdtype|local) ;no hold, Asterisk can play MOH or exten => s,1,capicommand(holdtype|hold) ;ISDN-HOLD or ; not yet implemented exten => s,1,capicommand(holdtype|notify) ;notify the peer only, Asterisk can play MOH Retrieve: Gets back the holded call. An optional parameter is the reference ID of the call on hold. Example: exten => s,1,capicommand(retrieve) or exten => s,1,capicommand(retrieve|${MYHOLDVAR}) ECT: Explicit call transfer of the call on hold (must put call on hold first!) Example: exten => s,1,capicommand(ect|${MYHOLDVAR}) or [macro-capiect] exten => s,1,capicommand(ect) [default] exten => s,1,capicommand(hold) exten => s,2,Wait(1) exten => s,3,Dial(CAPI/contr1/1234,60,M(capiect)) Using CLIR ========== Use the SetCallerPres() application before you dial: exten => _X.,1,SetCallerPres(prohib_not_screened) exten => _X.,2,Dial(CAPI/contr1/${EXTEN}) Enjoying early B3 connects (inband call progress, tones and announcements) ========================================================================== Early B3 is configurable in the dialstring parameters. If you set a 'b', early B3 will always be used, also if the call fails, because the number is unprovisioned, etc ... If you set a 'B', early B3 will only be used on successful calls, giving you ring indication,etc... Don't use indications in the Dial command, your local exchange will do that for you: exten => _X.,1,Dial(CAPI/contr1/${EXTEN}/B,30) (early B3 on success) exten => _X.,1,Dial(CAPI/contr1/${EXTEN}/b,30) (always early B3) exten => _X.,1,Dial(CAPI/contr1/${EXTEN},30,r) (no early B3, fake ring indication) exten => _X.,1,Dial(CAPI/contr1/${EXTEN}/b,30,r) (always early B3, fake indicatons if the exchange does not give us indications) exten => _X.,1,Dial(CAPI/contr1/${EXTEN}/B,30,r) (early B3 on success, fake indicatons if the exchange does not give us indications) For normal PBX usage you would use the "b" option, always early B3. Overlap sending (a.k.a. real dialtone) ====================================== When you dial an empty number, and have early B3 enabled, with: Dial(CAPI/g1//b) The channel will come up at once and give you the dialtone it gets from the local exchange. At this point the channel is like a legacy phone, now you can send DTMF digits to dial. Example context for incoming calls on MSN 12345678: =================================================== [capi-in] exten => 12345678,1,Dial(SIP/phone1) exten => 12345678,2,Hangup Short HOWTO of capicommand(receivefax...) and capicommand(sendfax...): ========================================================================== For those of you who have a CAPI card with an on-board DSP (like some Eicon and DIVA Server), this allows you to receive/send faxes. capicommand(receivefax|[||]): ------------------------------------------------------------ If you want to answer a channel in fax mode, use capicommand(receivefax|...) instead of Answer() If you use Answer(), you will be in voice mode. If the hardware DSP detects fax tone, you can switch from voice to fax mode by calling capicommand(receivefax|...). The parameter is mandatory and the parameters and are optional. To enable fax tone detection and redirect to extension 'fax', use config variable 'faxdetect' in capi.conf. Example of use : line number 123, play something, if a fax tone is detected, handle it line number 124, answer directly in fax mode [incoming] exten => 123,1,Answer() exten => 123,2,BackGround(jpop) exten => 124,1,Goto(handle_fax,s,1) exten => fax,1,Goto(handle_fax,s,1) [handle_fax] exten => s,1,capicommand(receivefax|/tmp/${UNIQUEID}[||]) exten => s,2,Hangup() exten => h,1,deadagi,fax.php // Run sfftobmp and mail it. The output of capicommand(receivefax|...) is a SFF file. Use sfftobmp to convert it. With a DIVA Server, following features are provided: - fax up to 33600 - high resolution - Color Fax - JPEG Compression is disabled (not tested yet) capicommand(sendfax|[||]): ------------------------------------------------------------ To send a fax, you can use the same mechanism like with receivefax. Just replace the with the path to the .SFF file to send. After disconnect of a fax connection, the following variables will be set for that channel: FAXSTATUS : 0 = OK, 1 = Error. FAXREASON : Value of B3 disconnect reason. FAXREASONTEXT : Decoded text of FAXREASON value. FAXRATE : The baud rate of the fax connection. FAXRESOLUTION : 0 = standard, 1 = high. FAXFORMAT : 0 = SFF. FAXPAGES : Number of pages received. FAXID : The ID of the remote fax maschine. CLI command "capi show channels" ================================ This CLI command shows detailed info on all CAPI channels. Column description: Line-Name : the name of the interface as defined in capi.conf NTmode : is the line in NT mode instead fo TE mode state : the state of the channel, like 'Conn', 'Disc', 'Dial', ... i/o : incoming or outgoing line bproto : protocol on CAPI ('fax', 'trans' or 'rtp') isdnstate : a string which may consists of the following characters * = PBX is active G = Line-Interconnect (CAPI bridge) active B = b-channel is up b = b-channel is requested P = Progress was signaled H = this line is on hold T = this line is in transfer (ECT) mode S = SETUP[_ACK] was signaled ton : type of number value number : the caller-number and destination-number Asterisk variables used/set by chan_capi ======================================== BCHANNELINFO On incomming call, this variable is set with the B-channel information value: '0' : B-channel is used (default) '1' : D-channel is used (not implemented yet) '2' : neither B nor D channel is used (e.g. call waiting) Call-Waiting: an incoming call with BCHANNELINFO not '0' cannot be accepted. Another connection must be dropped before accepting or use capicommand(deflect|) to initiate call deflection to another destination. CALLEDTON The 'type of number' value of the called number is saved in this variable on incomming call. _CALLERHOLDID If a call is put on hold (ISDN-HOLD), the reference id is saved in this variable. This variable is inherited as CALLERHOLDID to the dialed channel and will be used if e.g. capicommand(ect) is used to transfer the held call. CALLINGSUBADDRESS If set on dial(), the calling subaddress will be set to the content. CALLEDSUBADDRESS If set on dial(), the called subaddress will be set to the content. CONNECTEDNUMBER Can be set before answering and if set, the content is used for IE 'Connected Number' on answering. FAXEXTEN If chan_capi sends the call to extensions 'fax', the original extension number is saved in this variable. PRI_CAUSE If set, this value will be used as hangup cause on hangup. REDIRECTINGNUMBER On incoming call, if the call was redirected to you by someone, the number of the redirecting party is saved in this variable. RDNIS is set as well. REDIRECTREASON If the incoming call was redirected to you, this variable is set with the reason value.