Source note · Cisco IP phone registration and TFTP and ITL and CTL
In the 8800 startup process the phone requests the CTL file first and then the ITL file, both from the TFTP server.
Checked 2026-09-24
The phone requests the ITL file after it requests the CTL file.
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- Startup
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Technical Details — Cisco Systems · tier 2 current vendor documentation · Phone Startup Process, steps Request CTL File and Request ITL File
Cite this note
APA
WarmTransfer. (2026, September 24). Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-ctl-before-itl. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-ctl-before-itl
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-ctl-before-itl,
title = {Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-ctl-before-itl},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-ctl-before-itl},
note = {Source note cisco-phone-registration-ctl-before-itl, checked 2026-09-24}
}