I hope to have some guidance from experienced users in my first Asterisk use.
I would like to setup an Asterisk system to allow conference calls to be established between 4 different callers, my company plus 3 other companies, using VOIP lines from an ADSL service into each company.
In my company I will use a intercom system and line hybrid interface that will connect into the Asterisk PABX.
In my understanding that interface will connect into an FXS port and the VOIP lines from the ADSL modem will connect to FXO ports. Can you confirm the concept and that I will require 2 VOIP lines to allow conferencing to be activated.