[cisco-voip] Looking for advice on sRTP using tokenless CTL

[Ryan Ratliff (rratliff)]

Additionally in 11.5SU3 and 12.0 we now sign the ITL and tokenless CTL files with the ITLRecovery certificate instead of CallManager.pem.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/rel_notes/11_5_1/SU3/cucm_b_release-notes-cucm-imp-1151su3/cucm_b_release-notes-cucm-imp-1151su3_chapter_00.html#reference_9C103B26C27EFA3008B593B943A6950C

This should greatly reduce the risk of inadvertent trust list issues caused by certificate operations.

-Ryan

On Oct 19, 2017, at 3:08 PM, Brian Meade <bmeade90 at vt.edu<mailto:bmeade90 at vt.edu>> wrote:

In 10.x, CTL/ITL are signed by the CallManager.pem if you do tokenless.  There's a recovery key in the ITL so you can run "utils itl reset localkey" to resign the ITL with the recovery key to recover your cluster.  But this doesn't help you with devices that don't support SBD like Jabber.

In 11.x, CTL/ITL are signed by the CallManager.pem if you do tokenless but there's also a recovery key for the CTL.  You can run "utils ctl reset localkey" to resign the CTL with the recovery key to recover your cluster.

So I'd recommend in your case that you upgrade to 11.x first or use physical tokens.

The latest 11.5 SU requires you to order a free encryption license through PUT as well.



On Tue, Oct 17, 2017 at 2:01 PM, Ryan Huff <ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>> wrote:
Looking at enabling sRTP on a 10.x cluster (CUCM, EXPRESSWAY, CXN, UCCX). As I have been researching this topic; I’ve found the “riskiest” task to be enabling CTL / Mixed Mode in CUCM. Specifically, if you have devices that do not support Security By Default.

It’s my understanding that once the callmanager cert changes, any device that can’t negotiate with the TVS service to establish verification will not be able to download the new CTL, and therefore not be able to re-register to CUCM until their CTL is removed.

The device/trunk security profile configurations seems straight forward as do the steps to take on CUBE and Expressway (regarding the trunk security).

I haven’t completed my research into the CXN/UCCX requirements for SRTP with CUCM.

Are their any other major/general pitfalls I should look out for? Anyone have any horror stories or lessons learned to share?

Thanks,

Ryan

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