Call routing
204
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
6. 4 Automatic reject of collect calls
1)
The public network in Brazil offers the possibility of collect calls. A collect call is a
call in which the called party accepts the costs of the call. The called party normally
has a few seconds to reject the collect call before he incurs costs. This decision can-
not be made if the call goes to a fax or automatic answering machine; thus, high,
unwanted costs may be incurred. To prevent misuse, the system can detect and re-
ject collect calls automatically.
Detection of collect calls
Detection of collect calls depends on which network interface the call comes
through:
Tab. 51 Detection of collect calls
Detection of collect calls on analogue network interfaces
A loop-break shortly after seizing (double answer) causes the collect call to be ter-
minated in the public exchange; normal calls, however, can be continued as usual.
For this purpose, the following parameters are configurable for the regions
(CM_2.5.1.2):
Tab. 52 Detection of collect calls on analogue network interfaces
1)
For the Brazilian sales channel only
Origin of the call Detection
Call from the public ISDN network The call is identified as a collect call and can be handled accord-
ingly.
Call from the public analogue network The call is not identifiable as a collect call and is routed in
accordance with normal routing. Only after call seizing can col-
lect calls be distinguished from normal calls with a loop-break
(see the section below).
Call comes via a SIP provider The call is not identifiable as a collect call.
Parameter Meaning
Loop interruption Duration of the loop-break in milliseconds.
Pause Duration in milliseconds between seizing the line and the loop-
break.
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