Version 68.0.28
My Yealink LDAP looks like the following:
#######################################################################################
## LDAP Settings ##
#######################################################################################
#Configure the search criteria for name and number lookups.
ldap.name_filter = (|(sn=*%)(gn=*%)(company=*%)(category=*%))
ldap.number_filter = (|(telephoneNumber=*%)(mobile=*%))
ldap.photo.enable = 1
ldap.enable = 1
ldap.host = xxx.xxxx.com
ldap.port = 2345
ldap.tls_mode = 0
ldap.base = ou=people
ldap.user = xxx.xxxx.com\211
ldap.password = xxxxxxxx
#Specify the maximum of the displayed search results. It ranges from 1 to 32000, the default value is 50.
ldap.max_hits = 50
ldap.name_attr = cn sn givenName
ldap.numb_attr = telephoneNumber mobileTelephoneNumber
ldap.display_name = %cn
#Configure the LDAP version. The valid value is 2 or 3 (default).
ldap.version = 2
#Conifugre the search delay time. It ranges from 0 (default) to 2000.
ldap.search_delay = 1000
#Enable or disable the phone to query the contact name from the LDAP server when receiving an incoming call; 0-Disabled (default), 1-Enabled;
ldap.call_in_lookup = 0
#Enable or disable the phone to sort the search results in alphabetical order; 0-Disabled (default), 1-Enabled;
ldap.ldap_sort = 1
#Enable or disable the phone to query the LDAP server when in the pre-dialing or the dialing state; 0-Disabled (default), 1-Enabled;
ldap.dial_lookup = 1
We can search after pressing a few letters, but at the start when you hit directory, it states "LDAP Server unavailable."