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 rtpengine

a=setup:actpass
a=fingerprint:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

confuse some UACs that were expecting only SDES. FreeSWITCH is affected.

Troubleshooting

Reproduction

rtpengine_manage("DTLS=off"). tcpdump the traffic between kamailio and rtpengine.
Obseve that there is no DTLS=off key.

Debugging Data

Log Messages

SIP Traffic

Possible Solutions

Don't look for DTLS key, let that be passthrough to kamailio

Additional Information

5.1.2

• Operating System:
  Linux CentOS 7.4

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