libcapi20-dev 1:3.8.2005-12-06-0ubuntu1 (amd64 binary) in ubuntu dapper

libraries for CAPI support
 If you have an ISDN card with which CAPI works, you may be able to use
 applications that use CAPI, e.g. a fax system. At this point, AVM cards can
 work with CAPI, as well as some active cards. For the AVM passive cards you
 need to visit the www.AVM.de website.
 .
 If you need this package, it will be installed automatically via dependencies,
 no need to select it yourself.