Configure LSC on IP Phone with CUCM

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/support/docs/content-networking/certificates/213295-how-to-install-an-lsc-on-a-cisco-ip-phon.html

Published

2026-07-09

Updated

unknown

Accessed

2026-10-02

HTTP status

200

License

Cisco copyright; no-redistribution; short excerpts and locators only

Source notes citing this source

• 802.1X with an LSC does not by itself require changing the phone's Device Security Mode, because the LSC is used toward the RADIUS server while Device Security Mode governs signalling to Unified CM. inferred in context
• When CAPF settings are applied with Bulk Administration, the Authentication Mode chosen must match the phone security profile's authentication mode or the operation cannot complete. in context
• Cisco lists an expired or past Operation Completes By time and a mismatch between the CAPF certificate in the phone's ITL file and the current CAPF certificate as causes of LSC installation failure. in context
• A current Cisco tech note states that on Unified CM releases with Security By Default (8.0(1) and later) the LSC install procedure applies whether or not the cluster is in mixed mode. disputed in context
• A successful LSC installation shows the phone's LSC Status as Installed and Certificate Operation Status as Upgrade Success in Unified CM. in context
• For an LSC Install/Upgrade, the Operation Completes By date and time should be at least one hour in the future, and the change is saved and then applied with Apply Config. in context
• Changing a phone security profile's Authentication Mode requires Save and Apply Config, which can restart every phone that uses that profile. in context

Cite this source record

APA

WarmTransfer. (2026, July 9). Configure LSC on IP Phone with CUCM. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-technote-213295-install-lsc-ip-phone

BibTeX

@misc{warmtransfer-cisco-technote-213295-install-lsc-ip-phone,
  title  = {Configure LSC on IP Phone with CUCM},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-technote-213295-install-lsc-ip-phone},
  note   = {Cisco Systems, accessed 2026-10-02}
}