Snom ONE IP, Техническое руководство

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Deploying the snom ONE IP Telephone System
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Generating the ANI
An ANI is an administrative number provided by the system to identify the caller to the
receiver and is not necessarily the originating number. Before the system can generate
an outbound call on a trunk, it must have an ANI. To get the ANI, the system first
checks the SIP URI in the
To/From
header and the identity headers (
P-Preferred-
Identity , P-Asserted-Identity or Remote-Party-ID ) for the user=phone
flag. When this flag is set, those numbers will be used as the ANI.
Figure 4-15. ANI and
user=phone
Flag
However, if the SIP URI does not contain the
user=phone
flag, the system looks for
the ANI from the following places (in the order listed here):
1. Extension account ( ANI setting): If the local account has an ANI number, the
system uses this number. Every extension, or any other account that has a dial
plan, also has an ANI number field. By entering this information, it is clear how
this account will be presented to the outside world.
2. Domain ( Default ANI setting):