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Routing in the PSTN
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== Hybrid routing == Hybrid routing uses numbering plans and routing tables to permit the [[Colocation (business)|colocation]], in the same [[area code]], of switches using a [[deterministic routing]] scheme with switches using a non-deterministic routing scheme, such as [[flood search routing]]. Routing tables are constructed with no duplicate numbers, so that [[direct distance dialing]] service can be provided to all [[telecommunications network|network]] subscribers. This may require the use of ten-digit [[telephone number]]s.
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