Not removing PAI despite Privacy: id

Hi,

I have an Acme configured as peering between a CUCM and an operator.

The CUCM is trusted the operator is untrusted.

The INVITE sent towards the operator from the CUCM contains, among others, the following:

     - From: "Anonymous" <sip:anonymous@anonymous.invalid>

     - Privacy: id

     - P-Asserted-Identity: <sip:0123456789@192.168.1.1>

The operator requires to receive the above parameters as is. However, the Acme seeing the "Privacy: id" removes these parameters from the INVITE message sent to the operator.

Is there a way to have the acme forward those parameters ?
Setting the operator as trusted is not an option.

Thanks and regards,