Hello from Spain, I have in my company a PBX that we are using at this moment. We want to migrate to VoIP, so after investigating for about a week we decided to use Asterisk, but save the old PBX. We have 7 telephone lines, and we want to connect 7 extensions from the PBX to the Linux box used for Asterisk. The question is concerning about what type of cards and how many we must buy from Digium to connect Linux to the PBX. We want to keep the PBX for use with the Fax and maintain a telephone directly connected to the PBX in case the Linux Box fails. I know this is not the best configuration... The company actually has about 3 telephones connected to the PBX, migrating almost all to VoIP. Thank you very much. (Yes, I know, my english is very very poor)