Phase 2: B-number at the same exchange or at a
different exchange?
nAt
the same exchange:
nQuery to
subscriber database:
nis
the subscriber banned for incoming calls?
nis
the subscriber entitled for the service he is using?
nis
the user in “call diversion unconditional” or “call waiting”
status
nAt
a different exchange:
nperform
routing analysis
ndepends
on user category, time of the day