Alternative routing
nDifferent PSTN traffic types, phone, fax and data require different properties from the transmission media
nHence they are sometimes routed via different routes
nExchange makes analysis based on B-subscriber number which route is to be selected
nIn dynamic routing exchange “learns” from its mistake
nif a direct connection is available it is selected first
nif too much congestion is encountered then the last successful route is selected
nAlternative routing aims to utilize network capacity better than load sharing
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