System Functions and Features as of I7.9
Call routing 143
syd-0200/3.0 – I7.9 – 11.2009
Call routing depends in principle on whether a call originates
• from the public network or
• from the private leased-line network (QSIG) and
• whether there is a suitable direct dial number for the phone number.
In terms of call routing, calls from a virtual PISN are handled in the same way as
calls from the public network.
The diagram below shows how an incoming call is routed:
Fig. 61 Routing an incoming call
Incoming call from the public network or from
the private network
Call via
analogue network
connection?
yes
yes
yes
no
no
no
no
no
no
no
Routing to CD as per
trunk group setting
Routing to CD as per
trunk group setting
Routing via transit
route towards exchange
Overwrite
call number
NPI?
Overwrite
NPI
Is E.164
the call number
NPI?
Network = public?
Direct
dialling plan
allocated?
DD number
found?
Routing to CD of
DD number
Suitable
number in
numbering
plan?
Routing to destination
of number found
Congestion tone
haz0726aaena0
yes
yes
yes
yes
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