Grandstream Networks UCM6510 IP PBX User Manual page 211

When an event list is created on the UCM6510 and remote extensions are added to the list, the UCM6510
will send out SIP SUBSCIRBE to the remote UCM6510 to obtain the remote extension status. When the
SIP end points registers and subscribes to the local UCM6510 event list, it can obtain the remote extension
status from this event list.
Once successfully configured, the event list page will show the status of total extension and subscribers for
each event list. Users can also select the event URI to check the monitored extension's status and the
subscribers' details.
Note:

To configure LDAP sync, please go to UCM6510 web GUI->PBX->Basic/Call Routes->VoIP Trunk.
You will see "Sync LDAP Enable" option. Once enabled, please configure password information for the
remote peer UCM6510 to connect to the local UCM6510. Additional information such as port number,
LDAP outbound rule, LDAP Dialed Prefix will also be required. Both the local UCM6510 and remote
UCM6510 need enable LDAP sync option with the same password for successful connection and
synchronization.

Currently LDAP sync feature only works between two UCM6510s.

(Theoretically) Remote BLF monitoring will work when the remote PBX being monitored is
non-UCM6510 PBX. However, it might not work the other way around depending on whether the
non-UCM6510 PBX supports event list BLF or remote monitoring feature.
Firmware Version 1.0.1.12 UCM6510 IP PBX User Manual Page 209 of 277