8800-series phones of hardware version V15 or later need at least MPP firmware 11.3.3 and cannot downgrade to earlier MPP firmware; the 8821 and 8831 cannot be migrated.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800
- Subsystem
- device migration
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Migrate your phone to Webex Calling — Cisco · tier 2 current vendor documentation · Supported phone models
Cite this note
APA
WarmTransfer. (2026, September 24). Building a hybrid Unified CM and Webex Calling environment for a phased migration: source note cucm-webex-calling-hybrid-build-8800-v15-no-downgrade. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-webex-calling-hybrid-build-8800-v15-no-downgrade
BibTeX
@misc{warmtransfer-claim-cucm-webex-calling-hybrid-build-8800-v15-no-downgrade,
title = {Building a hybrid Unified CM and Webex Calling environment for a phased migration: source note cucm-webex-calling-hybrid-build-8800-v15-no-downgrade},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-webex-calling-hybrid-build-8800-v15-no-downgrade},
note = {Source note cucm-webex-calling-hybrid-build-8800-v15-no-downgrade, checked 2026-09-24}
}