Call routing
190
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
6. 3. 8 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 cannot 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 reject collect calls au-
tomatically.
Detection of collect calls
Detection of collect calls depends on which network interface the call comes through:
Tab. 36 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 termi-
nated in the public exchange; normal calls, however, can be continued as usual. For
this, with the country settings ( =c3) in the section Collect calls the parameters Loop
break and Pause can be configured.
Handling of collect calls:
Collect call handling is set in the trunk group configuration ( =bg). Basically all col-
lect calls can be rejected, accepted or handled according to destination.
Note:
When incoming calls arrive via SIP network interfaces, collect calls and normal calls cannot dif-
ferentiated. This is why with the setting Reject all collect calls both collect calls and normal calls
are rejected.
1)For the Brazilian sales channel only
Origin of the call Detection
Call from the public ISDN network (CAS) The call is identified as a collect call and can be handled accord-
ingly
1)
.
1)
If the provider does not support the method with the signal MFC/R2 (default value) to detect collect calls, the
parameter Collect call blocking signal in the view ( =dg) at the CAS interface must be set to Loop break
(double answer). The detection of a collect call will then be carried out as on analogue exchange lines.
Call from the public analogue network The call is not identifiable as a collect call and is routed in accord-
ance with normal routing. Only after call seizing can collect 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.
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