Voice over Internet P ackets (VoIP)
Scenario Three.
This is an ambitious schenario - This would involve multiple "Server Sites" that would utilize the "Web-Host" Site to co-ordinate and authenticate requests from the other server sites. The individual "server" sites would have dynamic IP addresses and would have additional software installed that would be able to communicate with Multi-Line Telephone Subscriber Cards installed in these servers. A Multi-Line Telephone Subscriber Card has two, four, eight, sixteen (or more) Telephone Ports. These cards provide all of the features that are required to connect to a Telephone Line. They sense a ring and answer (after a pre-programmed number of rings), They hold the line open while a conversation takes place, and they hang-up the line after the conversation is finished. When a call comes in from the "trunk" side (this is called "Inward Dial" - this is Telephone Speak for a Telephone connection that is other than local - such as from another Telephone Exchange or a "Long Distance" call) - we will be referring to calls coming from the "Internet" as "Trunk Receive" calls, and calls going out over the Internet as "Trunk Send" calls. (Incidentally, out-going calls are refered to a "Outward Dial"). When a call is received from the trunk - it is a) authenticated (can't have any un-authorized calls tying up the system, b) scanned to see where it is to be routed to ( is it going to be processed for "outward dial" or "other address" (other address could be a recording saying the number is invalid - or that the call is unable to connect). If the call is to go out as an "Outward Dial" call, the first availiable line is accessed, then it is taken off-hook (this is what you do when you pick up your telephone). The requested number is then dialed by the card and the call is "processed". The calling party will hear the phone ringing and when the called party answers they will be able to talk to each other. The call processor will monitor the line, and the port for status and maintain the call as long as needed. When either of the callers hang-up, the call session will be terminated and everything will reset for the next calling event.
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