On Thursday 23 September 2004 18:04, Norbert Tretkowski wrote:
> * Martin Steigerwald wrote:
> > Gibt es ein ISDN-Telefon mit Anrufbeantworter, das sich von einer
> > Software von Linux aus steuern läßt?
>
> ISDN Karte in Rechner, Asterisk installieren, und IP Telefon dran
> stoepseln.
>
> Ja, ist etwas teurer. Macht aber Spass. :-}
>

Wenn's nicht so teuer sein soll, und auch noch als Anrufbeantworter und ISDN 
Vermittlung dienen soll, dann vielleicht auch:

PBX4Linux
http://isdn.jolly.de/

 PBX4Linux general features:

    * DSS1 signalling system (Euro ISDN) as specified in ITU Q.931 (mISDN)
    * using cheap ISDN cards to connect internal telephones
    * IP telephonie using Voice-over-IP as specified in ITU H.323 (OpenH323)
    * encryption of external calls using RSA key-exchange or preshared keying
    * multiple external lines of mixed type (point-to-point or 
point-to-multipoint)
    * multiple internal ports (real point-to-multipoint)
    * external calls
    * internal calls
    * calls via Voice-over-IP
    * VoIP<->ISDN gateway
    * integrated individual voice box with menu
    * capable of conferrences with unlimited number of parties
    * real-time audio processing for minimum audio delay (using a special 
kernel module "mISDN_dsp.o")
    * German and English tones and texts
    * streaming or playing preloaded tones
    * real time scheduling and prohibition of swapping for better performance
    * DTMF decoding
    * directory of numbers and their names
    * test mode
    * playback of audio LAW/wave files (for announcements)
    * external login to extension (retrieve message from answering machines, 
dial through, change diversion)
    * callback
    * pocket calculator
    * detailled debug log capability 



Features for each telephone 'extension':

    * caller ID (CLIP/COLP)
    * caller name (CNIP/CONP)
    * caller ID restriction (CLIR/COLR)
    * caller ID restriction on request (CLIRREQ/COLRREQ)
    * caller ID restriction ignore (CLIRIGN/COLRIGN)
    * forwaring and forwarded-to ID (redirecting/redirection number)
    * dialing any number/prefix after pick-up (direct external dialing, 
emegerncy phones)
    * mutiple ports that will ring simultaniousely on incomming calls
    * direct call forward (CFU)
    * call forward when busy (CFB)
    * call forward when no response after given seconds (CFNR)
    * ringing with parallel forwarding (CFP)
    * All forwarding can be done to multiple numbers that all ring 
simultaniousely.
    * forwarding of caller IDs using "CLIP no screening"
    * hiding of the forwarded caller
    * hiding of the forwarded-to number
    * ignore anonymous calls; Only works if your telephone company provides 
anonymous numbers to you
    * restricted dialing with different levels: no calls, only internal calls, 
local calls, national calls, international calls
    * delete option to delete digits when dialing external numbers (using '*' 
and '#' keys)
    * using telephones display to show numbers, names, functions, states, ...
    * adjust audio level
    * adjust timeouts for different call states
    * use own generated tones rather than external tones for different call 
states
    * show faked caller IDs (unscreened)
    * menu to easily select all dialing codes (using '*', '#' and '0' keys)
    * individual tones/patterns for each extension
    * recording of calls as LAW or wave file
    * log of all incomming and outgoing calls
    * individual phonebook
    * redial with a large history of numbers
    * reply incomming calls with large history of numbers
    * powerdialing of busy/disturbed numbers until reachable again.
    * change caller id of next call / all calls
    * change forwarding destinations
    * active/inactive notification during conference
    * pick-up a call that rings on a different phone (even when transferred to 
voice box) 



Voice box features

    * recording wave files with different bit widths
    * email announcement of received calls
    * email with attached audio files of recordings
    * answring a call that is already transferred to the voice box (pick-up)
    * play back of recordings from anywhere
    * limit of recording time
    * recoding during announcement (pretending of answering a call, to get the 
name of anonymous callers) 



External line features:

    * sending any subscriber number, national number or international number 
without beeing checked by the telephone company. (The special feature 
"CLIP/COLP no screening" must be subscribed.)
    * sending tones/patterns to external calls prior answer of call (The 
special facility must be subscribed.)
    * processing of anonymous external calls with caller ID (The special 
feature must be subscribe, but is only available to privileged subscribers.)
    * availablility check for external pbx lines, to block individual lines if 
they are disturbed.
    * make and answer data calls as they would be audio calls 



H.323 features:

    * connect an incomming H.323 call prior answer (ringing tone will be 
available to caller)
    * different audio codecs
    * gatekeeper register option
    * dialing of IP numbers via telephone keypad 


Siehe auch c't 9/2004 S.100: Tux vermittelt


Gruß,
Andreas