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Asterisk PBX MISDN

What is this

Asterisk is a full-featured PBX (Private Branch eXchange) Software.

As telephony traditionally has used ISDN and Analog Devices, it would be desirable to be able to connect the ‘old’ Devices to the PBX in order to utilize its features and connect via VOIP as well as traditional Landlines.

NT-Mode is required to drive a S0 Bus, which is where you usually connect your ISDN Phones to.

The Setup used here is :

AVM Fritz!Card ISDN v2            (mISDN, ISDN Line)

         |

         |

     Asterisk

         |

         |

Typhoon Quick Com ISDN 128 PCI    (mISDN, NT-Mode)

                                  Here the ISDN Phones are

                                  connected.

Retail Box Images

Here are Images of the AVM Fritz!Card PCI ISDN and the Typhoon Quick Com ISDN 128 PCI for easier Identification in the Shop.

Instead of the AVM Fritz!Card PCI ISDN , you could also use a second Typhoon Quick Com ISDN 128 PCI Card - which is cheaper and works equally well.

FritzISDN
Typhoon ISDN

mISDN configuration

edit /etc/misdn-init.conf

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card=1,avmfritz   ; or hfcpci if Typhoon Card
card=2,hfcpci
te_ptmp=1
nt_ptmp=2
poll=128
dsp_options=0
debug=0

asterisk’s misdn.conf

/etc/asterisk/misdn.conf

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[general]
debug=0
bridging=no      ; Important ! mISDN crashes (esp. w/ EchoCancel)
[default]
echocancel=no   ; Important ! mISDN crashes elsewise.
context=misdn
language=en
callgroup=1i
pickupgroup=1
[external]
ports=1
context=external
msns=*
[internal]
echocancel=128
echotraining=500
ports=2
context=internal
msns=*

Why not bristuff ?

I didn’t like the fact that bristuff patches all ends of asterisk and releated libraries - and thus is restricted to a certain version of the code.

mISDN appears to have all the features I need at this time, is fairly simple to configure - so Why Not ?

Links/References

http://www.asterisk.org/ |The Asterisk PBX

http://www.beronet.com/download/ |BeroNet mISDN Download ( get install-misdn.tar.gz)

http://sourceforge.net/projects/chan-capi/ |chan_capi for other cards (can run parallel to mISDN with own Card)

http://www.voip-info.org/wiki-Asterisk |A valuabe Source of Information and Tips

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