I'm trying to replace an aging Nortel phone system with an Asterisk based system. The existing system work something like this:
Phone 1- -Line 1 Phone 2-- --Line 2 Phone 3---Server---Line 3 Phone 4-- --Line 4 Phone 5- -Line 5
People from the outside call Line 1's number. The server then rings all of the phones, which show a call on Line 1. Someone picks up a phone, and they are connected with the caller. If the main number is busy, and someone else calls it, it is routed to Line 2, or line 3, etc. I plan to put in VoIP hardphones and an Asterisk server, then use a Digium card to connect the existing POTS lines to the Asterisk server. How would I accomplish something like this in Asterisk? Specific config examples would help.