1. LDAP Server settings
Advanced feature -----> Phone book ----->LDAP Server
User name:cn=user,dc=ippbx,dc=com
 Password:password 
Directory Node:dc=ippbx,dc=com
2. LDAP settings on zycoo phone

 for other phones and the configuration are same ,just noted the base and username password.
zycoo support team
20180524