The following attempted workaround also fails:
1. don't use DTLS=off, force transport
rtpengine_manage("ICE=remove transport-protocol=RTP/SAVP");
2. rtpengine side use dtls-passive
rtpengine --dtls-passive
For some reason this also doesn't work, as rtpengine after rewritng SDP adds
a=setup:actpas
It is a side effect of PR #1460.
More specific, from mailing list discussion
(https://lists.kamailio.org/pipermail/sr-users/2018-March/100539.html), the
related change should be:
```
+ else if (str_eq(&key, "DTLS"))
+ ng_flags-
@rfuchs hoping you can take a look at this. The merge to master and backport
to 5.1.2 has broken my use of rtpengine_manage("DTLS=off") since the DTLS key
is removed from the ng-protocol messaged and not processed by rtpengine.
It is needed specifically for FreeSWITCH in SDES (who for some reas
### Description
rtpengine module is hijacking the DTLS key
rtpengine_manage("DTLS=off")
DTLS=off is a valid command to rtpengine, but the module uses that flag
to set transport as UDP/TLS/RTP/SAVP
Unfortunately even though the transport can be fixed by RTP/SAVP, the lines
outputted by rtpengin
