Creating an Asterisk exchange with 3G dongle

Script to connect E160 dongle to broadband
Install Asterisk manually on Raspbian ie not using raspbx
IP Forwarding and iptables configuration when using the Pi as a router ( with WiFi Access point )

Forwarding must be enabled
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
0
root@raspbx:~# sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
1
root@raspbx:~#