Features of PBX4Linux

Here are some of the key features. This list will not up-to-date, so check the documentation for all features.

PBX4Linux general features:

• DSS1 signalling system (Euro ISDN) as specified in ITU Q.931 (mISDN)
• using cheap ISDN cards to connect internal telephones
• 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)
• BRI and PRI lines support
• Ports can be blocked, closed, and opened at run-time.
• external calls
• extension context calls
• routing engine for detailed dial plan and voice menus.
• remote socket API to link other applications, like Asterisk (chan_lcr)
• 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

Featues for connecting to Asterisk

• to be done...