Asterisk vs ISDN

Some information on how to conect Asterisk to the ISDN
Chapter 3-1:

Hardware and protocol support

Last update:
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Overview of available options
Chapter 3-2 -->
NT-mode support


Choosing which way to go - Hardware and protocol support

Now how to choose what way go go with all these option?
First the easy part:
Not all hardware interfaces (mostly PCI cards) are supported by all driver architectures.
On the other hand you have to select by the signalling (D-channel) protocol you have to use to talk to your Telco or your terminal(s).
Here is a (possibly incomplete) list of what goes with what:

bristuff /
same as dahdiAdds support for cards made by and others utilising HFC chips to dahdi, including HFC-E1
capiDepending on the CAPI used:
DSS1, NI-1, DMS-100, 5ESS,
VN3, 1TR6, DSS2, GSM
Some of the high end cards ship with a CAPI driver
For many of those cards this is the only option
The standard Linux kernel includes support for active AVM and Eicon Diva cards
Since spring 2012 it is possible to use CAPI with all cards supported by mISDN (included in Linux)
dahdiDSS1, NI-1, NI-2, DMS-100,
Designed by Digium to support their hardware
Many other vendors cards designed for Asterisk / voice applications use this as well, directly or indirectly
dahdi-extrasame as dahdiAdds support for HFC-S PCI cards, Aligera ap400, some OpenVox drivers, Voicetronix OpenPCI
plus OSLEC echo compensation to dahdi
misdn1 / misdn2DSS1 only All cards based on HFC chips including USB dongles, Infinion and Winbond chips and some made by AVM, Sedlbauer and NETJet
pika???Support fur hardware by
SirrixDSS1, QSIGSupport fur hardware by
visdnDSS1 onlyCards with HFC chips
zaphfc /
same as dahdiAdds support for single port HFC-S PCI cards to dahdi
The vast majority of BRI cards sold in the last years use HFC chips made by Cologne Chip Design.
These can easily be identified by a depiction of the Cologne Cathedral on the chip.
Supported chips are (at least) HFC-S, HFC-4S, HFC-8S, HFC-E1 and HFC-USB.


<-- Chapter 2
Overview of available options
Chapter 3-2 -->
NT-mode support