I want to give a solution to my company regarding the IP Telephony setup. Our call manager is located on remote site and one of our office 40 users needs to connect via lease line with this call manger.
I will use 2821 with WIC-2T and EVM-HD-8FXS/DID High density voice/fax extension module - 8FXS/DID with EM-HDA-3FXS/4FXO 7-port voice/fax expansion module-3FXS/4FXO
My office has two Fax line and one Nortal PBX with 4 Ports.
But i m stil confuse how outbound will work once the lease line failure because I dont have any PRI/PSTN connectivity.
Please let me know FXO/FXS modules that i have mentioned are the right one.