RFC 5859 says that when option 150 and the TFTP Server Name option (66) are both present, option 150 SHOULD take priority over option 66.
Checked 2026-10-02
this option SHOULD have priority over option 66
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- DHCP option 150
- Deployment
- on-premises
- Region
- not restricted
- Release range
- RFC 5859
- Checked
- 2026-10-02
Sources
- RFC 5859: TFTP Server Address Option for DHCPv4 — IETF / RFC Editor · tier 1 standards and regulators · Section 3
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66. WarmTransfer. https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66
BibTeX
@misc{warmtransfer-claim-ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66,
title = {Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66},
note = {Source note ip-phone-dhcp-vlan-troubleshooting-opt150-over-opt66, checked 2026-10-02}
}