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Reply To: How many lines do I need?


Total erlang traffic =
11*7*37/60 = 47.48

So at 2% blocking probablity for 47.48 erlang you need 58 circuits.

1 T1 line consists of 24 circuits, If one circuit is reserved for signalling remaining 23 can be used for voice.

So, Number of T1 requird = 58/23 = 3 (approx)