About the ESI IVX E-Class 72e Generation II Phone System This Cabinet comes 0x0. It is empty for you to choose which cards you would like to install for the configuration of your choice. The 684 card (6 COs, 8 digital stations, and 4 analog lines) or the 612 card (6 COs and 12 digital stations) can be added. This system also supports the 12, 16, 24, or 48 button (Including remote and local IP) ESI telephones. The system can only hold a total of 4 cards. (Expansion ring required for cards 3 and 4) 612 and E2-612, 684 and E2-684, A12 and E2-A12, D12 and E2-D12 DLC12 and E2-DLC12 and the IVC (Intelligent VoIP Card) are all compatible cards with this system. .
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