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?