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Collaboration, Voice & AV · Foundational

DHCP Option 150

A Cisco-specific DHCP option that gives IP phones a list of TFTP server addresses for downloading configuration files.

Definition

Option 150 can carry multiple TFTP IP addresses for redundancy, unlike the standard option 66, which carries a single server name or address. Phones request their SEP<MAC>.cnf.xml configuration and firmware from the TFTP server listed. If both are present, Cisco phones prefer option 150.

Example

option 150 ip 10.1.1.10 10.1.1.11 in a Cisco IOS DHCP pool points phones to two CUCM TFTP servers.

Exam tip

Option 150 is a list of IP addresses; option 66 is a single string. Missing TFTP options leave phones stuck downloading configuration.

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