On a Cisco 8800 phone running enterprise (CUCM) firmware, the screen message 'Enter activation code or service domain' is documented as caused by a missing TFTP address; the fix is to check DHCP option 150 or configure an alternate TFTP server manually.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- TFTP discovery
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Troubleshooting — Cisco Systems · tier 2 current vendor documentation · Startup Problems > Phone Not Registering
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-activation-prompt-no-tftp. WarmTransfer. https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-activation-prompt-no-tftp
BibTeX
@misc{warmtransfer-claim-ip-phone-dhcp-vlan-troubleshooting-activation-prompt-no-tftp,
title = {Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-activation-prompt-no-tftp},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-activation-prompt-no-tftp},
note = {Source note ip-phone-dhcp-vlan-troubleshooting-activation-prompt-no-tftp, checked 2026-10-02}
}