How does the connection between a cisco call manager and the cisco pbx works and how does the cisco phone central work in general?
can already existing pstn and isdn lines be connected to a call manager?
the reason why i'm asking this question is because I am wondering how a local network with a few ip phones and a callmanager gets connnected to "the world" how phonecalls with regular phones can be received and made.
anyone who can give me some more info on this topic?
thanks in advance