Junghanns stopped supporting failover ISDNGuard for their devices in Asterisk 1.6 and later, so we did a module from scrach compatible with Asterisk 1.8, Asterisk 10, 11 and 12 and we publish it here so that the community can continue its development if they desired.
cd /usr/src/asterisk-xxx
git clone https://github.com/sinologicnet/isdnguard
cp isdnguard/res_isdnguard.c res/
make
make install
ls -la res_isdnguard.so
Elio Rojano
http://www.sinologic.net/
