Is there anyway on an OBi to prove a secure connection?

The Subject line basically asks the question I'm posing: Is there any way on an OBi 200/202 to verify that SRTP media encryption is being used on a call from the OBi to its adjacent endpoint? Barring a way of ascertaining this information on the OBi, is there an Asterisk command which does so, presuming the other end terminates on an Asterisk server?

The ancillary evidence indicates SRTP is working properly: The voice path is established if both ends either force or refuse SRTP, and fails if they are configured to be at odds with each other. However, it would be nice to have a way of determining definitively whether a secure channel exists on a given call.

Enquiring minds...