asterisk users - Apr 2019 - pjsip vs chan_sip: Where is callerid(num) taken from?

Dear List

We are renewing our voicemail server and by this occasion I am
migrating from chan_sip to pjsip.

I have come to a problem I have not experienced on other pjsip examples.

Switzerland was heavily SS7 based in the past.

So usually you have a Network provided A Number, which is mapped to the
PAI Header in SIP.
And there is the user provided phone number aka Generic Number, aka
Display Number, which is to be displayed to the destination and which
is transmitted in the From: Header.

So the From: Number is the one we want as source of the call in the
voicemail:

With chan_sip:

Set(Caller=${CALLERID(number)})

${Caller} contains the number from the From: header

With pjsip:

${Caller} contains the number from the PAI header

Any clue how I can change this pjsip behavior?

Mit freundlichen Grüssen

-Benoît Panizzon-
-- 
I m p r o W a r e   A G    -    Leiter Commerce Kunden
______________________________________________________

Zurlindenstrasse 29             Tel  +41 61 826 93 00
CH-4133 Pratteln                Fax  +41 61 826 93 01
Schweiz                         Web  http://www.imp.ch
______________________________________________________

Ok, just figured it out, looks like pjsip uses some reversed trust
logic...

PAI contains the network provided screened number, the one which can be
trusted and used for billing purposes and similar.

From contains the generic number, which should be displayed, but which
is user provided and therefore not very trustworthy.

So of course I want to trust the PAI (billing etc) and Display the From:
header on the called phone.

trust_id_inbound=yes

But this causes the PAI Number to be filled in callerID(number)
switching to 'no' causes the From Number, to be filled in
callerID(number).

Very odd!

Mit freundlichen Grüssen

-Benoît Panizzon-
-- 
I m p r o W a r e   A G    -    Leiter Commerce Kunden
______________________________________________________

Zurlindenstrasse 29             Tel  +41 61 826 93 00
CH-4133 Pratteln                Fax  +41 61 826 93 01
Schweiz                         Web  http://www.imp.ch
______________________________________________________