Source note · Troubleshooting Cisco IP phone registration
An 8800 Series phone is factory reset from the keypad by removing power, holding # while restoring power until the Headset and Speaker buttons light, then entering 123456789*0#; the reset clears all phone parameters.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- IP Phone 8800 Series
- Subsystem
- reset
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Maintenance — Cisco Systems · tier 2 current vendor documentation · Maintenance > Factory Reset > Perform Factory Reset from Phone Keypad
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-factory-reset. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-factory-reset
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-factory-reset,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-factory-reset},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-factory-reset},
note = {Source note cisco-phone-registration-troubleshooting-factory-reset, checked 2026-09-24}
}