I’m using Asterisk 13.12.1 and FreePBX 188.8.131.52 but having a difficult time getting SIP TLS & SRTP to work on a Cisco SPA525G2 phone. I’ve followed this guide: TLS & SRTP which is pretty much straight forward but from what I gathered the Cisco SPA525G2 requires a “Mini Certificate” and “SRTP Private Key” as shown by the Cisco SPA525G2 web admin screenshot:Subscriber Information it just states what I need to do with the “Mini Certificate” but not how to obtain one or what it is. Also, if I copy the default.key value from /etc/asterisk/keys on my FreePBX system I’m not able to paste the entire value into the SRTP Private Key field as a good portion of it is cut off after pasting. So that makes me believe I’m going about this all wrong. At this point, I’m not sure what to do so if anyone has an idea or actual success setting this up then I would really appreciate the assistance.