More info as I am looking for the solution in case anyone else wants to be a
detective....
In configuration, this is set during route[]
```$var(rtp_params) = "replace-origin ICE=remove replace-session-connection";```
then, during INVITE with SDP:
```if (rtpengine_offer("$var(rtp_params)")) {```
and finally during onreply_route[] with SDP:
```rtpengine_answer("$var(rtp_params)");```
What is happening is SOMETIMES, $var(rtp_params) is NULL before it gets sent
into rtpengine_answer().
If I change all instances of the variable to just be the hard-coded string of
flags, then everything works fine. In fact, the $var is NEVER null in the
onreply_route[] when I do that.
My belief now is that rtpengine_offer() is somehow NULLifying the value of the
$var as if it were passed by reference, but only SOMETIMES.
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