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