The II-sources are written by Dietmar Friede and Juergen Krause.
For all these sources:

  Copyright, (c) 1995 Dietmar Friede and Juergen Krause

   These programs are free software; you can redistribute them and/or modify
   them under the terms of the GNU General Public License as published by
   the Free Software Foundation, version 1.

   These programs are distributed in the hope that they might be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   in the file docs/copying.doc
   along with these programs; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

Acknowledgement:
alaw/ulaw  from isdndrv-0.1.1 (Henrik (marsu@palumbia.IN-Berlin.de))