How to verify if SRTP is working from Debug logs

Need Help - is there any way we can verify if SRTP is working from Asterisk debug logs. Configured SRTP on asterisk 1.8.26.1, testing on polycom phones but having SRTP enabled on extension doesn’t work so configured “encryption = yes” on sip.conf which works on polycom phone. now i would like to check if the srtp is really working or not for logs.