Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
Because current 8800 documentation still lists CPPDP as the Peer Firmware Sharing protocol, the same-model, same-subnet, port-4051 behaviour in the legacy PFS technote probably still applies to 7800/8800 phones, but that has not been confirmed in a current document.
inferred · Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- peer firmware sharing
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Technical Details — Cisco Systems · tier 2 current vendor documentation · Network Protocols (CPPDP row)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-pfs-modern-scope, checked 2026-10-02}
}