[Freeswitch-users] Anyone got ZRTP MiTM working?

Hi, I've asked this question several times before but unfortunately I have yet to get any reply. Has anyone managed to get FS to recognize and enroll a ZRTP enabled client like CSipSimple? For some reason, on my default install from git, when dialing 9787 the lua script answers the call but tells me that it is only available for ZRTP enabled endpoints. Obviously it isn't recognizing the ZRTP hash even though I do see it in the FS logs. I also tried the same experiment with Jitsi and got the same results, even though ZRTP was clearly enabled. So, any clue as to why FS doesn't seem to recognize the ZRTP hash from the clients and enroll as trusted MiTM? Thanks, Peter