September 2005
Intermediate to advanced
408 pages
16h 20m
English
Content preview from Asterisk: The Future of Telephony
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Name
CallingPres() — Changes the presentation for the Caller ID
Synopsis
CallingPres(presentation)Changes the presentation parameters for the Caller ID on a Q931
PRI connection. These parameters should be set before placing an
outgoing call. The argument presentation
controls two things: whether or not the person being called can view
the Caller ID information (known as
presentation), and whether or not the Caller ID
information has been verified by an authoritative source (known as
screening).
Tip
This application has been replaced by the SetCallerPres() application, which is
easier to use and less dependent on the internal Zaptel
structures.
This application takes the call presentation setting and the screening setting and combines them into one number. The values themselves are defined in the ITU Q931 standard, as shown in Tables B-1 and B-2.
Table B-1. Screening is controlled by bits 2 and 1
Bit 2 | Bit 1 | Explanation |
|---|---|---|
0 | 0 | Caller ID information was provided by the user, and not screened. |
0 | 1 | Caller ID information was provided by the user, and successfully verified. |
1 | 0 | Caller ID information was provided by the user, and verification failed. |
1 | 1 | Caller ID information was provided by the network. |
Table B-2. Presentation is controlled by bits 7 and 6
Bit 7 | Bit 6 | Explanation |
|---|---|---|
0 | 0 | Presentation of the Caller ID information is allowed. |
0 | 1 | Presentation of the Caller ID information is restricted. |
1 | 0 | The number is not available due to interworking. |
1 | 1 | Reserved. |
Bits 3, 4, 5, and 8 should all be set to zero (0). Please note ...
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