Identification elements
100
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
PISN - Internal Call with Overflow Routing
User C (340) on PINX 2 calls user A on PINX 1 via PINX 3 as all the available commu-
nication channels between PINX 2 and PINX 1 are busy. PINX 3 belongs to
Region 60.
Fig. 37 Example 2: User C calls user A, overflow routing (excerpt from Fig. 35)
Tab. 26 Example 2: Creating and presenting user C’s CLIP number
Step CLIP number NPI TON Description
1 340 PNP level 0 User C → PINX 2
• There is no suitable DDI number.
2 50340 PNP level 1 PINX 2 → PINX 3
3 50340 PNP level 1 PINX 3
• There is no suitable DDI number.
4 50340 PNP level 1 PINX 3 → PINX 1
5 340 PNP level 0 PINX 1
• The system’s own regional prefix is deleted
• TON is adapted.
6 340 PINX 1 → User A
• Presentation on the system phone
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