Privacy id replaces From uri to Anonymous

Hello all!

We have a case when ACME SD receives Privacy: id parameter within INVITE message.

In that case it strips Privacy header and changes From header to anonymous@anonymous.invalid.

Our goal is not to change anything, neither Privacy nor From header.

Can someone help us with this issue?

Trace and sip-interface configuration:

=== Signalling Plane ===

   === Internet Protocol ===

   IP Version                               : 4 = IPv4, Internet Protocol

   Internet Header Length                   : 5 = 20 Bytes

   Precedence                               : 000..... = Routine.

   Delay                                    : ...0.... = Normal delay.

   Throughput                               : ....0... = Normal throughput.

   Reliability                              : .....0.. = Normal reliability.

   Monetary cost                            : ......0. = Normal monetary cost.

   Reserved                                 : .......0

   Total Length                             : 848

   Identification                           : 125

   Reserved                                 : 0.......

   Do not fragment                          : .0...... = Fragment if necessary.

   More fragments                           : ..0..... = This is the last fragment.