[asterisk-users] Questions about SIP From, P-Asserted-Id fields and Diversion headers ?

[George Joseph]

On Tue, Jun 5, 2018 at 10:59 AM Olivier <oza.4h07 at gmail.com> wrote:

>
>
> 2018-06-05 15:27 GMT+02:00 George Joseph <gjoseph at digium.com>:
> Thank  you very much, George for replying.
>
>>
>>
>> On Tue, Jun 5, 2018 at 3:35 AM Olivier <oza.4h07 at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> After a long discussion with a friend, I would like to ask here:
>>>
>>> 1.According SIP RFCs, is possible/recommended to have different values
>>> in From and P-Asserted-Id fields ?
>>> For instance, From field showing 123456789 and P-Asserted-Id showing
>>> 987654321 (beside privacy considerations) ?
>>>
>>
>> Possible? yes absolutely.
>>
>
> How would you then configure both headers, respectively ?
>
> From memory, in previous testings, whenever  CALLERID was set to WHATEVER,
> P-Asserted-Id was also set to WHATEVER and vice versa, so that I inferred
> from this that P-Asserted-Id was meant for Privacy considerations and
> nothing else (see [1])
>

PAI should be used to indicate the calling party's identification
regardless of privacy concerns.  In the dialplan you can use the CALLERPRES
function to control privacy on a call by call basis.




>
>
> [1]
> https://www.voip-info.org/p-asserted-identity-and-remote-party-id-header/
>
>
>> Recommended? who knows?  Implementations are all over the place.  I've
>> always thought of the From header as identifying the user agent making the
>> request which kinda agrees with RFC3261.   The PAI header should contain
>> the identity of the original caller.
>>
>>
>>>
>>> 2. When Bob forwards to Cory a call coming from Alice, would expect
>>> Diversion/History-Info header to include Alice's number ?
>>>
>>
>> No.  The diversion header shows who the diverter is.
>> https://tools.ietf.org/html/rfc5806
>>
>>
>>
>>
>>>
>>> Best regards
>>> --
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>>
>>
>>
>> --
>> George Joseph
>> Digium, Inc. | Software Developer
>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - US
>> Check us out at: www.digium.com & www.asterisk.org
>>
>>
>> --
>> _____________________________________________________________________
>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>
>> Check out the new Asterisk community forum at:
>> https://community.asterisk.org/
>>
>> New to Asterisk? Start here:
>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>
>> asterisk-users mailing list
>> To UNSUBSCRIBE or update options visit:
>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users



-- 
George Joseph
Digium, Inc. | Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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