Source note · Troubleshooting calling in the Webex App
Unified CM sign-in error 1000:1001 (ServiceDiscoveryFailure) tells the user the app cannot find the phone service and to check phone service preferences.
Checked 2026-10-01
Can't find your phone service. Check your phone service preferences
- Vendor
- Cisco
- Product
- Webex App
- Subsystem
- service discovery
- 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 1000:1001
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-ucm-err-1000-1001. WarmTransfer. https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-ucm-err-1000-1001
BibTeX
@misc{warmtransfer-claim-webex-app-calling-troubleshooting-ucm-err-1000-1001,
title = {Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-ucm-err-1000-1001},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-ucm-err-1000-1001},
note = {Source note webex-app-calling-troubleshooting-ucm-err-1000-1001, checked 2026-10-01}
}