Extensions for which TLS and secure RTP was enabled in version 14, inherit this setting, when PBX is updated to v.15.5 and traffic is encrypted (works in SP2, as you can already import certificate and private key). How about to enable this for another extension, for which this setting was not enabled in v.14 before upgrade to v.15.5 ? Looks like this feature is missing in v.15.5. In Parameter settings | DN properties only Secure SIP is available, does this enables secure RTP as well ? Setting Secure SIP value to 1 is not enough.