opensips. how to hide the RTP traffic and topology

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opensips. how to hide the RTP traffic and topology

LAVer
hi
Now, such a scheme works:

(UAC       )---->sip----->Opensips 1.7--->SIP--->MGW Cisco
85.85.85.85               85.85.85.2             85.85.85.3
|-----------------------------RTP-------------->MGW Cisco-------->PSTN

In this topology visible

It's not safe, it's necessary to build a new wiring diagram:
(UAC      )--->sip,RTP---->(Opensips--->rtp,SIP------>)----->MGW Cisco--->PSTN
85.85.85.85                (85.85.85.2     192.168.0.2)     192.168.0.3

questions:
1. to hide the network topology from the users (can be used dialog module, function: topology_hiding?)
2. hide RTP traffic to MGW for Opensips-server (can be used rtpproxy module?)
Please, give examples cfg-file ?