SIPS and SRTP for users in OpenLDAP

Hello. I’m trying to establish SIPS and SRTP for users in OpenLDAP db, but the asterisk schema doesn’t have the two necesary fields for this (transport, encryption) or any other field related to TLS. It is no documented. Without ldap I have succesfully configured this establishing the fields transport=tls and encryption=yes. Freepbx 13 does this writing on mysql db the same fields.

Can somebody help me? Thanks!