LDAP settings for Active Directory

[goback]

I'm trying to setup my Yealink T41P (Firmware Version 36.72.0.55) to use LDAP to search through our Active Directory users.

When searching in the LDAP directory there are always "None" results
I've tested the connection settings with LDAPExplorerTool

Am I forgetting something ?

This is my configuration
[ LDAP ]
bEnable = 1
strLdapName =
strNameFilter = (|(cn=%)(sn=%))
strNumberFilter = (|(telephoneNumber=%)(mobile=%))
strServerName = 192.168.1.1
nServerPort = 389
strBase = dc=companyname,dc=local
strUserName = domainadmin@companyname.local
strUserPin =
nMaxHits = 5
strNameAttr = cn sn
strNumbAttr = mobile telephoneNumber
strDisplayName = %cn
nProtocolVersion = 3
bLookup4CallIn = 1
bLookup4Dial = 0
bSortResult = 1
nSearchDelay = 0