System Functions and Features as of I7.9
136 Call routing
syd-0200/3.0 – I7.9 – 11.2009
5 Call routing
This Chapter describes the interplay between the routing elements for the various types
of traffic: call routing for internal, incoming and outgoing traffic. Other topics include
Least Cost Routing, exchange-to-exchange traffic, transit routing in the private leased-
line network, overflow routing and break-out.
5. 1 Overview
This chapter is divided as follows:
• Internal traffic (as of page 136)
• Incoming Traffic (as of page 142)
• Outgoing traffic (as of page 163)
• Least Cost Routing (LCR) (as of page 181)
• Exchange-to-Exchange Connection (as of page 199)
• Transit Routing in the Private Leased-Line Network (as of page 212)
• Testing overflow routing in the PISN (as of page 222)
• Break-Out (as of page 227)
5. 2 Internal traffic
5. 2. 1 Internal Destinations
Many internal destinations are allocated numbers in the internal numbering plan.
These destinations are dialled directly by dialling these numbers or the names allo-
cated to them.
The table below shows the internal destinations, their availability and their dialling
options.
Tab. 28 Internal destinations and their availability
Internal destinations Remarks
Internal users assigned one or more termi-
nals:
Selectable using number and name selection
• AD2 terminals
• Terminals on the S bus
• Analogue terminals
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