Asterisk Add-On Package
From ImageStream Router Documentation
To install the Asterisk add-on package, be sure you are running the latest version of the ImageStream Linux 4.4 or 5.0. To update your router software to the latest 4.4 distribution, type the following from the command line:
When the update is finished, reboot the router. When the router is booted, return to the command line and type the following commands:
addon_hd configure addon_hd format Enable addon_hd Install asterisk Enable asterisk Start asterisk backup flash
Access the Asterisk web admin via: http://192.168.0.1:8080/asterisk/static/config/cfgbasic.html
Change the IP to the IP of your router.
The asterisk configs are stored in /etc/asterisk which is on the ramdisk just like all other router settings.
Any changes that are made to the asterisk configs will need to be saved to flash using the "backup flash" command or the save configuration to flash menu option.