I have a problem with UAC sending RPID in 200 OK response which is then copied by Freeswitch to A-leg. All methods I've tried so far allowed for removal or modification of RPID header in outgoing INVITE on B-leg, but when B-leg sends 200 OK response, it contains RPID header which is copied and passed down to A-leg, messing up with caller id displayed on the phone. Is there a way to stop this behaviour? Below is a diagram of an example call.

UAC A                                FS                                UAC B
|            INVITE                  |                                 |
|         contains RPID              |                                 |
|----------------------------------->|            INVITE               |
|                                    |       no RPID (correct)         |
|                                    | ------------------------------->|
|                                    |                                 |
|                                    |            200 OK               |
|                                    |         contains RPID           |
|              200 OK                |<--------------------------------|
|  contains RPID, copied from B-leg  |                                 |
|      I want this RPID removed      |                                 |
|<-----------------------------------|                                 |