Hello,
I can give you a FREE DEMO of conference calling system, in which PINs are generated to everyone but conference will be started when Chair person is joined.
You wanted this system in freepbx, I can also make it for freepbx but I can also give you FREE DEMO ...
secondly, I can also give you free demo of Fax2Mail and Mail2Fax but your Project budget $100 is Extremely low for these 3 solutions (Conference, Fax2Mail, Mail2Fax) ....
Please let me know if you need FREE DEMO.
Regards,
Aneel