[cisco-voip] ABCD as route pattern characters?

[Lelio Fulgenzi]

Can anyone tell me what the characters ABCD are used for in route patterns? 

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Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
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