| Well, "PRI or Primary Rate Interface is a switched service delivered OVER a T1 connection" (borrowed from some site). A T1 can be used for a lot of things and you "cut" them up however you like. Part of it for data, part of it for voice, etc.
With that said, a full T1 PRI has 24 channels (like having 24 FXO ports) but, one of those channels is used for signaling, so you can only use 23 channels for communication. So you can have up to 23 inbound/outbound calls simultaneously.
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Now, I re-read this topic and I'm not really sure what you are hoping to do. I know you mentioned you currently have a Nortel system. How is it currently connected. Are you looking to replace it, or integrate it as I mentioned? How many users do you currently have, and are you expecting expansion.
Or, are you looking to make the Asterisk system your "personal" telephone system? Meaning, it will only handle calls for your extension off of the Nortel and not anyone elses? |