RTSPS/SRTP Backchannel streaming: Key exchange mechanism clarification #626
Description
ONVIF Streaming spec in the section about SRTP streaming refers to RFC 4567 for key exchange.
But it is not clear how it can work with Backchannel streaming that is part of the Profile O.
According to RFC 4567 a packets sender provides a key and additional info in the SDP. And a received uses this information for packets decoding. But in case of Backchannel streaming a client is a sender but only a receiver (camera) sends SDP. So, a Client will not be able to provide a key to a device using mechanism described in RFC 4567.
