cisco webex desktop pro - insufficient security error

[Chet Cronin]

Well one headache after another .. 
Running Desktop Pro - Room OS  11.1.2.4
Settings > Conference > Encryption Mode = ON

I make a call to my local CMS and get the following error:  Unable to establish Encryption
Call Log indicates "InsufficientSecurity"

When I call an external Bridge It connects with good A/V.  The connection is AES 128. 
 

[Mohamed H. Abdelmotaleb]

for the SIP Trunk between the CUCM and CMS , did you use secure sip trunk profile or non-secure ?