Wireless TLS/SRTP phone for Asterisk 11.11

I am running the lastest Asterisk 11.11 Asterisk server.

I am looking for a wireless phone like the GrandStream DP715 that will work with TLS and SRTP.

I have the GrandStream DP715 working with TLS but cannot get SRTP working.

FYI – the DP715 uses the speakerphone to announce dropped calls and other notifications. If you got the DP715 working with SRTP, any idea how to fix the loud beep notifications?