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
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
