Call routing
172
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
6. 3. 1. 2 Call from the Private Leased-Line Network
In the private leased-line network, direct dialling plans are set up only if calls are to be
routed to their destinations via call distribution elements in order to benefit from the ad-
vantages of the flexible routing properties of call distribution elements (see "Call Distri-
bution Element (CDE)", page 120).
Call distribution elements can be dialled up directly if they have been allocated a phone
number in the numbering plan and if they exist as PISN users in the other PINXs. How-
ever, without a direct dialling plan it is more difficult to achieve a numbering that
matches.
Tab. 27 Flexible routing with and without direct dialling plan; difference in numbering
Calls from the private leased-line network do not have any DDI numbers. If you set up
a separate direct dialling plan, however, these numbers can also be handled in the
same way as DDI numbers.
Tip:
Only individual numbers can be organized via a direct dialling plan; the others are organized
directly in a numbering plan.
Routing with Direct Dialling
A call with a suitable number in the direct dialling plan is routed to the destination via
the call distribution element allocated there.
If the first few digits of the phone number match the number entered under Own re-
gional prefix in the numbering plan, they will be truncated before the search for a suita-
ble direct dial number is carried out.
• Overwrite NPI No
1)
• DDI plan 1 (relevant only if a suitable DD number is found)
• Call Distribution Element 1 (reference number of a call distribution element)
Call distribution element 1:
• Call destinations Switch position 1: User 220 + KT
• Max. incoming calls Number of calls allowed simultaneously with several destinations
1)
Not relevant for trunk groups with analogue network interfaces
PINX 2
PISN users
PINX 1
DDI number
PINX 1
Call Distribution
Element
PINX 1
Destination user
with direct dialling plan 250 250
→
250 1 250
without direct dialling
plan
250 – 1, phone number
250
251
Parameter Parameter value