i am installing Kamailio using apt in a debian 8 machine by following this guide
http://kb.asipto.com/kamailio:skype-like-service-in-less-than-one-hour
i managed to create a few users and through Jitsi to talk to each other.
once i reboot the machine, then the problems start and Kamailio cannot start.
here are a few details from my system.
-/etc/apt/sources.list the part for Kamailio
#Kamailio
deb     http://deb.kamailio.org/kamailio51 jessie  main
deb-src http://deb.kamailio.org/kamailio51 jessie  main


-Version info
Distributor ID:    Debian
Description:    Debian GNU/Linux 8.10 (jessie)
Release:    8.10
Codename:    jessie

-root@debian:~# systemctl start kamailio
Job for kamailio.service failed. See 'systemctl status kamailio.service' and 'journalctl -xn' for details.

root@debian:~# /etc/init.d/kamailio start
[....] Starting kamailio (via systemctl): kamailio.serviceJob for kamailio.service failed. See 'systemctl status kamailio.service' and 'journalctl -xn' for details.
 failed!


Any ideas, please?