[cisco-voip] sRTP and RTP in SIP Invite

[Brian Meade]

Mark,

Is the device actually using TLS for the signaling?  I don't think CUCM
will let you use SRTP if the signaling channel isn't encrypted.

Brian


On Fri, May 30, 2014 at 11:41 AM, Mark Holloway <mh at markholloway.com> wrote:

> 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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