Hello,

I am trying to implement RTPEngine failover, where if a selected RTPEngine node fails in the middle of the call (and not responding NG requests), I want to select an alternative node. However, when I call rtpengine_manage(), it does not seem to select an alternative node in case of a failure. To address this, I have attempted to check if $avp(RTP_INSTANCE) is null after calling rtpengine_manage(), and then use rtpengine_delete() to forget the selected RTPEngine node for the specific call, with the expectation that Kamailio would assign a new RTPEngine node for subsequent SIP message retries. However, it appears that rtpengine_delete() does not have the desired effect in this regard.

Here is an excerpt of my code for reference:
```
route[RTP] {
#!ifdef WITH_RTPENGINE
        if (has_body("application/sdp")) {
                if ($avp(x_source) == "INTERNAL") {
                        rtpengine_manage("replace-session-connection replace-origin direction=internal direction=external");
                }
                else if ($avp(x_source) == "EXTERNAL") {
                        rtpengine_manage("replace-session-connection replace-origin direction=external direction=internal");
                }

                if ($avp(RTP_INSTANCE) == $null) {
                        rtpengine_delete();
                        drop();
                }
        }
#!endif
}
```

Can you please advise on how I can achieve the desired failover behavior? Is there another function similar to `rtpengine_reset_call` that can make Kamailio forget the RTPEngine node for a specific call?

Thank you!
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