Hi,

 

The debatable scenario is as follows:

 

A new SIP session is going to be established.

Via SIP/SDP SRTP is negotiated.

But the counterpart sends unsecured RTP.

After two seconds it stops RTP and starts the negotiated SRTP with another
SSCR.

 

Is this behaviour permitted by any RFC?

I did not find a clear definition for this scenario.

 

Any advice is welcome.

 

Thanks,

Guido

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