User Manual

Yealink Skype for Business HD IP Phones Administrator Guide

server on the DHCP server, an alternate method of automatically discovering the provisioning

server address is required. Connecting to the secondary DHCP server that responds to DHCP

INFORM queries with a requested provisioning server address is one possibility. For more

information, refer to RFC 3925. If a single alternate DHCP server responds, this is functionally

equivalent to the scenario where the primary DHCP server responds with a valid provisioning

server address. If no DHCP servers respond, the INFORM query process will retry and eventually

time out.

DHCP Option 66 and Option 43

Yealink Skype for Business phones support obtaining the provisioning server address by

detecting DHCP options during startup.

The phone will automatically detect the option 66 for obtaining the provisioning server address.

DHCP option 66 is used to identify the TFTP server. DHCP option 43 is a vendor-specific option,

which is used to transfer the vendor-specific information.

The administrator can use vendor class identifier, specified by DHCP option 60, to send the

Skype for Business phone a customized configuration in option 43. Depending on the vendor

class ID it is configured for, the option 43 might have different values. Two vendor class

identifiers are used when deploying with the Skype for Business Server: a VLAN ID request

(vendor class ID: CPE-OCPHONE) and a certificate provisioning service URL request (vendor class

ID: MS-UC-Client). For more information on DHCP option 60, refer to DHCP Option 60 on page

32.

To use DHCP option 66 and option 43, make sure the DHCP Active feature is enabled.

Procedure

DHCP active can be configured using the configuration files or locally.

Configuration File

<y0000000000xx>.cfg

Configure DHCP active.

Parameters:

auto_provision.dhcp_option.enable

Local

Web User Interface

Configure DHCP active.

Navigate to:

http://<phoneIPAddress>/servlet?p=s

ettings-autop&q=load