[asterisk-users] Asterisk rewrites "From" header when CALLERID(num-pres)=prohib_passed_screen is set

[Kevin P. Fleming]

On 01/19/2012 05:56 AM, effie mouzeli wrote:
> When the date was Thu Jan 19 2012 12:12:04, Stefan Schmidt wrote:
>
>> Hello,
>>
>> IMHO asterisk acts exactly as it should. How else do you think it should
>> it prevent sending out the callerid name or num when you set it to prohib?
>>
>
> This behaviour is new in 1.8, since in 1.6 it work differently (not forcing the "From" header to the default asterisk caller ID). Does the RFC say that a UAS must change the "From" header to secure privacy, even though there is a special header for privacy (or set privacy=full in Remote-Party-ID)?
>
> In case asterisk is not functioning as a PBX but as intermediate proxy, how do we secure its interoperability with other systems? So the issue here is that we are unable to change/keep the "From" header when CALLERID(num-pres)=prohib_passed_screen is set.

Asterisk cannot act as a proxy, it is a B2BUA. If you want to make its 
behavior *appear* to be a proxy, there are a number of things you can 
do, but it will never just 'pass along' headers from an incoming INVITE 
to an outgoing INVITE.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
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