Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Monitoring Phone Systems

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8800-series/english/adminguide/P881_BK_C136782F_00_cisco-ip-phone-8800_series/P881_BK_C136782F_00_cisco-ip-phone-8811-8841_chapter_01101.html

Published

2025-11-06

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• The 8800 status message File not found <Cfg File> means the phone's configuration file is not present on the TFTP server. in context
• The 8800 status message File Not Found <CTLFile.tlv> indicates the Unified CM cluster is not in secure (mixed) mode, so there is no CTL file to download. in context
• The 8800 status message Phone failed to register. Cert key size is not FIPS compliant indicates an RSA certificate shorter than 2048 bits that must be replaced. in context
• The 8800 status message No Trust List installed means neither a CTL nor an ITL file is installed on the phone. in context
• The 8800 status message TFTP timeout means the TFTP server did not respond, pointing to a network or TFTP server problem. in context
• The 8800 status message Trust List update failed means the CTL and ITL update did not succeed, pointing to a network or server-side problem. in context
• On the 8800 series the Status Messages screen (Applications > Admin settings > Status > Status messages) shows the 30 most recent status messages the phone generated. in context
• The phone status message 'DHCP timeout' means the DHCP server did not respond. in context
• The phone status message 'Duplicate IP' means another device is using the IP address assigned to the phone. in context
• The phone status message 'File not found <Cfg File>' means the phone's configuration file was not found on the TFTP server, which the guide ties to the phone not being in the Unified CM database. in context
• The phone status message 'No default router' means DHCP or static configuration did not specify a default router. in context
• The phone status message 'TFTP timeout' means the TFTP server did not respond; the guide suggests checking connectivity and that the TFTP server is active. in context
• The phone status message 'No Trust List installed' means no CTL or ITL file is installed, and 'Trust List update failed' means an update of the CTL and ITL files failed. in context
• The phone's Restart Cause field reports values including TCP-timeout, CM-closed-TCP, KeepaliveTO, Failback, Phone-Reg-Rej, Load Rejected HC and CM-ICMP-Unreach. in context
• On an 8800 Series phone, status messages, network statistics and call statistics are under Applications > Admin settings > Status. in context

Cite this source record

APA

WarmTransfer. (2025, November 6). Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Monitoring Phone Systems. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-8800-admin-guide-cucm-monitoring

BibTeX

@misc{warmtransfer-cisco-8800-admin-guide-cucm-monitoring,
  title  = {Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Monitoring Phone Systems},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-8800-admin-guide-cucm-monitoring},
  note   = {Cisco Systems, accessed 2026-09-24}
}