AudioCodes 400HD Series - DHCP Option 120; DHCP Option 42; DHCP Option 43; Table 2-1: DHCP Option 43 Configuration Reference

400HD IP Phones Series - Teams Compatible
Administrator's Manual 22 Document #: LTRT-09960
2.1.1.1 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
Skype for Business server. Use the table as a reference to make sure each sub-option is
correctly configured. Sub-option 010 is shown in the next section (VLAN Discovery via
DHCP).
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 skypeforbusinessserver.domain.com
004 WebServerPort 443
005 CertProvRelPath /CertProv/CertProvisioningService.svc
2.1.1.2 VLAN Discovery via DHCP Option 43
Option 43 comprises the five sub-options 001-005 shown in the previous section, as well as
sub-option 010, shown in the table below. Sub-option 010 is used to specify a voice VLAN.
It is not mandatory.
Refer also to http://technet.microsoft.com/en-us/library/gg398088(v=ocs.14).aspx
Table 2-2: DHCP Option 43, Sub-Option 010, Configuration Reference
Sub-Option Number Sub-Option Name ASCII Value (example)
010 VoiceVLAN Valid values: 1-4094
2.1.1.3 DHCP Option 120
Option 120, which includes the Skype for Business 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 2-3: DHCP Option 120 Configuration Reference
Option Number Option Name ASCII Value (example)
120 UCSipServer skypeforbusinessserver.domain.com
2.1.1.4 DHCP Option 42
Option 42 specifies the servers that provide NTP / SNTP for the network. Make sure NTP
server IP addresses are correct, as shown in the table below.
Table 2-4: DHCP Option 120 Configuration Reference
Option Number Option Name String (example)
42 NTP Servers 10.59.0.20, 10.59.0.21