I am using Asterisk (original) v188.8.131.52 compiled with Lib SRTP 1.4.2.
In the phone and provider trunks I have:
encryption = yes
When making an outgoing call I am getting the message:
[Feb 16 17:50:43] WARNING: sip/sdp_crypto.c:167 sdp_crypto_activate: Could not set local SRTP policy
I am using a Yealink T28P phone (SRTP turned on) and a upline provider who support SRTP (They are using Asterisk as well).
When calling another extension (Also a T28P with SRTP support turned on) on the same PBX I do not get this message.