The README and capi.conf of the chan-capi package provides
basic information for usage.
Here is some more information:
Each port of your ISDN card(s) need to have an own interface entry in capi.conf.
Don't specify two or more controllers with 'controller=X' in capi.conf
If you want to use call-reroute (aka call-deflection), see ChanCapiCallReroute.
* ChanCapiCallCompletion (CCBS/CCNR)
* ChanCapiChat (Meetme conference rooms)
chan-capi Q.SIG features
You will find informations about Q.SIG support here: ChanCapiQsig