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PRI sizing? any good ratios to start with?

I know I should be going off Erlongs, and all that fun stuff.. but are their any industry standards for PRI sizing? For instance..

4 DIDs to 1 PRI Channel?

Thanks

2 REPLIES
New Member

Re: PRI sizing? any good ratios to start with?

You answered your own question: the industry standard method for determining trunk sizing is Erlang B.

http://www.erlang.com/link_traffic.html

Blue

Re: PRI sizing? any good ratios to start with?

If you don't have the call data to perform Erlang calculations, you just need to take a SWAG, and adjust as needed. Ratios or rules of thumb are difficult because users are so different. An insurance sales office will need more trunks than a similar sized engineering firm.

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