Cisco Ip Phone Downloading Xmldefault Cnf Xml Repack |link| -
Technical Overview: Cisco IP Phone XMLDefault.cnf.xml XMLDefault.cnf.xml
file is a critical component in the Cisco IP Phone boot and registration sequence. It serves as a global configuration template for phones that have not yet been explicitly provisioned with a device-specific configuration file. 1. The Boot and Download Sequence
When a Cisco IP phone boots, it follows a standardized TFTP (Trivial File Transfer Protocol) request order to obtain its operational parameters: MAC-Specific Request : The phone first attempts to download SEP
: If the TFTP server returns a "file not found" error for the MAC-specific file, the phone requests the global XMLDefault.cnf.xml Information Retrieval : From this file, the phone learns vital details including: IP address and port
for the primary Cisco Unified Communications Manager (CUCM). Firmware Load ID it is expected to run. Softkey and localization settings. 2. Downloading the XMLDefault.cnf.xml
For maintenance or troubleshooting, administrators can manually retrieve this file from the TFTP server using several methods: IP Phone, SCCP & SIP Phone Registration Process with CUCM
Understanding the Cisco IP Phone boot process is key to troubleshooting "Downloading XMLDefault.cnf.xml" loops. When a phone hangs at this stage, it usually means it cannot find its specific configuration file and is falling back to the generic default. How to Fix the Cisco IP Phone "XMLDefault.cnf.xml" Loop
When a Cisco IP Phone boots, it follows a strict sequence to obtain its configuration. If it gets stuck downloading XMLDefault.cnf.xml
, it is often a sign of a communication breakdown between the handset and the TFTP server. 1. The Boot Sequence Breakdown cisco ip phone downloading xmldefault cnf xml repack
To solve the issue, you must understand where the process is failing: DHCP Request:
The phone asks for an IP and "Option 150" (the TFTP server address). CTL/ITL Files: The phone attempts to download security tokens. Specific Config: The phone looks for SEP
If your phone is stuck in a "repack" or "downloading" loop, check these three areas: TFTP Server Issues Service Status:
Ensure the Cisco TFTP service is running in Unified Serviceability. File Availability: Verify that the XMLDefault.cnf.xml actually exists in the TFTP directory. Rebuild Configs: In CUCM, go to Device > Phone , find the device, and click Apply Config to force a file regeneration. Network and DHCP Misconfiguration Option 150:
Ensure your DHCP scope is correctly pointing to the CUCM Subscriber’s IP address. VLAN Mismatch:
Confirm the phone is on the correct Voice VLAN and can reach the TFTP server's IP. Firewalls: must be open for TFTP traffic. Firmware Mismatches
The "repack" message often indicates the phone is trying to change its firmware version to match what is defined in the XMLDefault If the phone cannot find the firmware files ( , etc.) on the TFTP server, it will loop indefinitely. 3. Step-by-Step Troubleshooting Checklist Check the Phone Console Logs:
Access the phone's web interface (if enabled) to see exactly which file is failing to download. Verify MAC Address: Technical Overview: Cisco IP Phone XMLDefault
Ensure the MAC address entered in CUCM matches the physical sticker on the phone. Restart TFTP: Sometimes the TFTP cache hangs. Restarting the service via Cisco Unified Serviceability often clears the "repack" loop. Factory Reset:
As a last resort, perform a hard reset (hold # while powering up, then dial 123456789*0# ) to clear old ITL files.
If you are migrating phones between clusters, the phone may be rejecting the new XMLDefault
file because of a security signature (ITL) from the old cluster. You must delete the ITL file manually on the phone's settings menu. deleting ITL files for specific phone models? technical table of the required UDP/TCP ports? meta-description for this post?
This review focuses on the common scenario where a Cisco IP phone becomes stuck or repeatedly displays "Downloading XMLDefault.cnf.xml." This typically indicates a failure in the boot sequence where the phone cannot find its specific configuration file and falls back to a default file that may be misconfigured or missing. Understanding the Boot Sequence
When a Cisco IP phone boots, it follows a specific hierarchy to obtain its configuration:
Specific Config: The phone first requests a unique configuration file named SEP based on its physical MAC address.
Default Fallback: If the specific file is not found on the TFTP server, the phone requests XMLDefault.cnf.xml. Pro Tip: Debug the TFTP Conversation
Still stuck
Auto-Registration: This default file is primarily used for new, unprovisioned phones to learn the IP address of the Cisco Unified Communications Manager (CUCM) and download the correct firmware. Key Causes for "Downloading" Loops
If your phone is stuck in a loop or fails at this stage, it is often due to one of the following issues:
Pro Tip: Debug the TFTP Conversation
Still stuck? Enable debug tftp events on a Cisco router acting as a helper or capture the TFTP traffic:
tcpdump -i eth0 -s 0 -w tftp.pcap port 69
Look for:
Error code 1: File not found→ File missing or wrong name.Error code 2: Access violation→ File exists but corrupted.
If the phone keeps re-requesting XMLDefault.cnf.xml every few seconds, the file is likely parsed and rejected. Check your CUCM version logs: RTMT > Logs > TFTP > tftp.log for XML validation errors.
Prerequisites:
- A TFTP server (tftpd64 on Windows, atftpd on Linux)
- The correct SIP or SCCP firmware for your phone model
- The phone’s MAC address
Cisco IP Phone Troubleshooting: Decoding "Downloading xmldefault.cnf.xml" and the "Repack" Fix
By [Your Name] | Network Engineering Lead
If you manage a Cisco Unified Communications Manager (CUCM) environment, you have likely stared at the screen of a Cisco IP Phone (7940, 7960, 7906, or 7912) watching it cycle through its boot process. One of the most common—and often misunderstood—messages displayed is: "Downloading xmldefault.cnf.xml"
For many administrators, this message signals a broken phone. For others, it appears fleetingly as a normal step. But when you add the word "repack" into the troubleshooting mix—specifically, hunting for a "repack" of the xmldefault.cnf.xml file—you enter a niche area of legacy VoIP restoration.
This article will dissect exactly what xmldefault.cnf.xml is, why your phone is stuck downloading it, and what the community-driven term "repack" means for reviving old Cisco IP phones.
Part 4: Building Your Own "Repack" – A Step-by-Step Guide
Instead of downloading a risky repack from an unknown source, you can build your own xmldefault.cnf.xml from scratch. This is the definitive way to solve the downloading loop.
