"The best business telephones in the world."

Hello everybody !
I try to get my snom-phones (type 821) to connect to my ldap server, but they even don't do a ldap research. I can reach my ldap server with a client software (jxplorer on a mac) and also from my smartphone. So the server should be running fine.
I fullfilled the ldap-part in the webinterface as followed:
LDAP:

LDAP name filter:
(|(cn=%)(sn=%)) 

LDAP number filter:
(|(telephoneNumber=%)(Mobile=%)) 

Server Address:
192.168.1.127 

Port:
389 

Base:
ou=Users,dc=insider,dc=lan 

Username:
 

Password:
 

Max. Hits:
50 

LDAP name attributes:
 

LDAP number attributes:
 

LDAP display name:
 

Countrycode:
 

Areacode:
 

LDAP over TLS:
off 

Sort Results:
off 

Predict Text:
off 

Do an initial Query:
on  

phone: snom 821-sip
firmware: snom821-SIP 8.7.5.35
ldap-server: openldap (linux)
connected to a fritzbox 7390 as pbx

The ip-address, netmask and ip-gateway are povisioned by the dhcp-server. The server type support under identity/sip is "default" - if this is useful or needed.

I attache the pcap-trace. There you can see, that there is no ldap-research at all.

Can someone give any advice? 

Hallo Pietro,

thx for the answer. With the attributes it is working. I didn't realise that it is a must. I also found that the telephonebook in the webuserinterface is only the internal one and does not display any ldap-contacts. I configured a functionkey to display the ldap t-book and now i can see the contacts.

Wolfgang