[asterisk-users] Automatic Number Identification and anonymous calls

[Maximilian Grobecker]

Hello,

I know about the german phone system that the sense of an anonymous call
is, that the called party has no way to get the caller's number in any way.
The last switch honours the "anonymous" bit and removes the phone
numbers before sending the call to the called party.

In EURO-ISDN you have a feature called "CLIRO" which means "Calling Line
Identification Restriction Override" and is only availiable to emergency
services or special governmental services.
With this line feature the last switch ignores the anonymous bit and you
can see both caller id and ANI.

The US phone system may work in another way, but if I call another
person and want to hide my number I would appreciate if my phone number
is not sent to the called party in any field.
So this issue sounds to me more like feature than a bug ;-)



Greetings from Wuppertal
Max Grobecker


Am 09.02.2012 11:12, schrieb Olivier:
> 2012/2/8, Kevin P. Fleming <kpfleming at digium.com>:
>> On 02/08/2012 12:40 PM, Olivier wrote:
>>> 2012/2/8, Kevin P. Fleming<kpfleming at digium.com>:
>>>> On 02/08/2012 10:06 AM, Carlos Alvarez wrote:
>>>>>
>>>>> On Wed, Feb 8, 2012 at 2:35 AM, Olivier<oza_4h07 at yahoo.fr
>>>>> <mailto:oza_4h07 at yahoo.fr>>  wrote:
>>>>>
>>>>>      I always thought that ANI (Automatic Number Identification) could
>>>>> not
>>>>>      directly be set or changed by end users.
>>>>>      In this experiment, it seems that if an end user calls anonymously,
>>>>>      the ANI is also hidden to the receiving party.
>>>>>
>>>>>
>>>>> I never work with analog lines, but I do believe that anything less than
>>>>> a PRI would have the blocking done at the telco end before you get it.
>>>>
>>>> Mostly correct; ANI is only delivered over ISDN, SS7 and *some* E&M
>>>> trunk circuits. Analog circuits have no ability to transport ANI.
>>>>
>>>> --
>>>> Kevin P. Fleming
>>>> Digium, Inc. | Director of Software Technologies
>>>> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype:
>>>> kpfleming
>>>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>>>> Check us out at www.digium.com&  www.asterisk.org
>>>>
>>>> --
>>>> _____________________________________________________________________
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>>>
>>> Thanks for telling ANI feature can't come along analog lines.
>>>
>>> I did another test towards an ISDN BRI line and got the same results :
>>> ANI and CID are either both displayed or both hidden at the same time.
>>
>> You need to talk to your provider to see if your circuit is provisioned
>> to send you ANI at all; if it's not sent by the provider, Asterisk just
>> duplicates the CLID into the ANI channel variable.
> 
> Then, may I say that I would prefer to have the ANI left blank, if the
> network doesn't provide this data, and let system administrators know
> about this.
> 
>  Most end-customer
>> (retail) ISDN circuits are not configured to send ANI unless the
>> customer asks for it.
> This matches what I had in mind : ANI being something dedicated to
> emergency services that may also be available to others requiring it.
> 
> 
>>
>> --
>> Kevin P. Fleming
>> Digium, Inc. | Director of Software Technologies
>> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>> Check us out at www.digium.com & www.asterisk.org
>>
>> --
>> _____________________________________________________________________
>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>> New to Asterisk? Join us for a live introductory webinar every Thurs:
>>                http://www.asterisk.org/hello
>>
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>> To UNSUBSCRIBE or update options visit:
>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>
> 
> --
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