I’ve got a non-Cisco SIP device sending SIP Invites to CUCM (SIP Trunk). The 
SDP from my device includes RTP and sRTP in the SIP Invite. Reading Cisco docs 
it looks like the way Cisco expects sRTP to work is the SIP Invite should only 
include sRTP assuming if the call should be encrypted.  If both RTP and sRTP 
are in the SDP, CUCM will always choose the first one in the list rather than 
the preferred type (sRTP in this example).  In my case RTP is being listed 
first then sRTP, therefore CUCM will never choose sRTP even though that is what 
I prefer.

Has anyone encountered this before and is there a way around it?  

Thanks,
Mark


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