How to connect external Kerio LDAP

[pushkino]

I configure the Global Address List connect to external LDAP.
What is LDAP filter, and why into an example is:

(&(|( cn=*%s*)( sn=*%s*)( gn=*%s*)( mail=*%s*)( zimbraMailDeliveryAddress=*%s*)
( zimbraMailAlias=*%s*)( zimbraMailAddress=*%s*))
(|( objectclass=zimbraAccount)( objectclass=zimbraDistributionList)))

What does this mean?
I try connect to external LDAP on Kerio Mail Server but get fail result in test.

[pushkino]

& - it's logical AND operation
| - it's logical OR operation.

For connect to Kerio Mail Server LDAP base use:
LDAP search base - fn=ContactRoot
LDAP filter: (|(mail=*%s*)(givenName=*%s*)(displayName=*%s*)(Mo bile=*%s*)) or other,
kerio not supported anonymous LDAP connection, use DN/password.