<div dir="ltr">Hi All,<br><div><br></div><div>I operate OpenSIPs in front of a bank of FreeSWITCH instances and I'm currently seeing an issue with FreeSWITCH crashing during a SRTP DTLS renegotiation triggered by a RE-INVITE.</div><div><br></div><div>I've tracked this down to a WSS registrar which is issuing rtpengine_offer(...) for the INVITE and any subsequent RE-INVITE. This happens thousands of times a day without issue however on occasion OpenSIPs sends that RE-INVITE request to a different rtpengine server from the pool. This writes in the new RTP proxy IP and initiates a new ICE negotiation, the client fails to handle this and the DTLS negotiation breaks down - RTPEngine warns "<i>Received invalid STUN packet from <a href="http://1.8.4.1:58184">1.8.4.1:58184</a>: MESSAGE_INTEGRITY attribute missing</i>" and FreeSWITCH segfaults.</div><div><br></div><div>Can anyone advise on what might be causing OpenSIPs to pick an unrelated RTP instance for the dialog? Any ideas for preventing that would be appreciated! I could conceivably save the socket after the initial offer against the dialog and use that for additional offers but hopefully that can be avoided. I use RTPEngine only as a proxy, perhaps I should simply prevent RE-INVITE's from sending additional offers so I only have one offer/answer/delete per call?</div><div><br></div><div>Thanks,</div><div><br></div><div>Callum</div></div>
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