[Freeswitch-users] Forcing SRTP/TLS connections

Hi, everyone. I've begun experimenting with SRTP and TLS connections since the ZRTP download seems offline for the foreseeable future...sigh. I've got the SRTP enabled in my conf/vars.xml for both internal and external connections, but it appears that I can still connect without security from an unconfigured ATA. What I want to know is how to enforce a secure connection at registration time. Ideally, I'd like to do this both between two freeswitch servers and between a freeswitch server and an ATA. Thanks in advance!