Product specifications

420HD IP Phone with Microsoft Lync
Administrator's Manual 74 Document #: LTRT-09930
6.4 How to Verify CA Certificate is Trusted / Authorized
by IP Phone
Problem
How do I know if my CA Certificate is trusted and authorized by the
IP Phone?
LCD Message
-
Corrective Actions
Verify whether your public trusted certificate is listed in Microsoft Public Trusted
Certificates (http://technet.microsoft.com/en-us/library/gg398270(v=ocs.14).aspx).
6.5 Invalid Time Server
Problem
The time server is invalid.
LCD Message
-
Corrective Actions
Ensure that NTP (DHCP Option 42) is configured in the DHCP server and is defined as
NTP SRV records. If not, manually configure it.
6.6 Invalid Time Offset
Problem
The time offset is incorrect.
LCD Message
-
Corrective Actions
Ensure that the Time Offset (DHCP Option 2) is configured in the DHCP server. If not,
manually configure Daylight Saving Time (DST) values in the 420HD IP Phone.