Source note · Troubleshooting calling in the Webex App
In Webex App with Unified CM calling, error 1000:8 (InvalidLifeCycleState) is presented as 'Phone service registration failed. Error:1000:8'.
Checked 2026-10-01
Phone service registration failed. Error:1000:8
- Vendor
- Cisco
- Product
- Webex App
- Subsystem
- phone service sign-in
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-01
- Checked
- 2026-10-01
Sources
- Webex App | Error messages for Calling — Cisco Systems (Webex Help Center) · tier 2 current vendor documentation · Unified CM > Sign-in errors table, row 1000:8
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-ucm-err-1000-8. WarmTransfer. https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-ucm-err-1000-8
BibTeX
@misc{warmtransfer-claim-webex-app-calling-troubleshooting-ucm-err-1000-8,
title = {Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-ucm-err-1000-8},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-ucm-err-1000-8},
note = {Source note webex-app-calling-troubleshooting-ucm-err-1000-8, checked 2026-10-01}
}