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420HD IP Phone with Microsoft Lync

Administrator's Manual 12 Document #: LTRT-09930

Correct configuration of these three is critically important. The other DHCP options shown

in the figure above are also important but are less susceptible to inaccuracies than these.

2.1.1 DHCP Option 43

Option 43 comprises the five sub-options 001-005 shown in the figure above and in the

table below. These point the phone to the location of the Certificate Provisioning service on

the Lync server. Use the table as a reference to make sure that each sub-option is

correctly configured.

Refer also to http://technet.microsoft.com/en-us/library/gg398088(v=ocs.14).aspx

Table 2-1: DHCP Option 43 Configuration Reference

Sub-Option Number

Sub-Option Name

ASCII Value (example)

001

UCIdentifier

MS-UC-Client

002

URLScheme

https

003

WebServerFQDN

lyncserver.domain.com

004

WebServerPort

443

005

CertProvRelPath

/CertProv/CertProvisioningService.svc

2.1.2 DHCP Option 120

Option 120, which includes the Lync Server’s fully qualified domain name (FQDN) as

shown in the table below, is required for the certification authority (CA) pool Registrar.

Use the table as reference to make sure Option 120 is correctly configured.

Table 2-2: DHCP Option 120 Configuration Reference

Option Number

Option Name

ASCII Value (example)

120

UCSipServer

lyncserver.domain.com

2.1.3 DHCP Option 42

Option 42 specifies the servers that provide NTP /SNTP for the network. Make sure that

NTP server IP addresses are correct, as shown in the table below.

Table 2-3: DHCP Option 120 Configuration Reference

Option Number

Option Name

String (example)

NTP Servers

10.59.0.20, 10.59.0.21

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 91 92

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