Proxy to add SRTP to Asterisk

Hi Community,
for our company we are running an Asterisk PBX in a datacenter. After some
years it is doing everything we want except of SRTP.
Would it be possible to run a proxy like FreeSWITCH which is capable of SRTP in front of Asterisk to convert SRTP
coming from our phones to RTP which is ok for Asterisk and vice versa?
Thanks,
schogge