Yealink SIP-T2 Series Administrator's Manual page 252

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
ldap.display_name = %cn
The cn of the contact record is displayed on the phone screen.
Permitted
String within 99 characters
Values
Default Blank
Web UI Directory->LDAP->LDAP Display Name
Parameter ldap.version
It configures the LDAP protocol version supported by the IP phone. The version must be the same as the
Description
version assigned on the LDAP server.
Permitted
2 or 3
Values
Default 3
Web UI Directory->LDAP->Protocol
Parameter ldap.call_in_lookup
Description It enables or disables the IP phone to perform an LDAP search when receiving an incoming call.
Permitted
0-Disabled
1-Enabled
Values
Default 0
Web UI Directory->LDAP->LDAP Lookup For Incoming Call
Parameter ldap.call_out_lookup
Description It enables or disables the IP phone to perform an LDAP search when placing a call.
Permitted
0-Disabled
1-Enabled
Values
Default 1
Web UI Directory->LDAP->LDAP Lookup For Callout
Parameter ldap.ldap_sort
Description It enables or disables the IP phone to sort the search results in alphabetical order or numerical order.
Permitted 0-Disabled
Values 1-Enabled
Default 0
Web UI Directory->LDAP->LDAP Sorting Results
Parameter ldap.incoming_call_special_search.enable
It enables or disables the IP phone to search the telephone numbers starting with "+" symbol and "00"
from the LDAP server if the incoming phone number starts with"+" or "00". When completing the LDAP
search, all the search results will be displayed on the phone screen.
Description
Example:
If the phone receives an incoming call from the phone number 0044123456789, it will search
0044123456789 from the LDAP server first, if no result found, it will search +44123456789 from the server
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<y0000000000xx>.cfg