Cisco Ip Phone Downloading Xmldefault Cnf Xml Repack -

The repack process is an automatic healing mechanism. It occurs under specific conditions:

| Condition | Explanation | |-----------|-------------| | Missing device file | Phone is not properly registered in CUCM, or MAC address typo exists. | | Corrupt default XML | The XMLDefault.cnf.xml file on the TFTP server is zero-byte or malformed. | | Permission issues | TFTP service cannot read the files directory. | | High CPU/load | TFTP service rebuilds the file repeatedly due to timeouts. | | Firmware mismatch | Phone firmware version is not supported by the current XMLDefault.cnf.xml schema. |

When the TFTP service repacks, it logs messages similar to:

%TFTP-3-REPACK: Repacking XMLDefault.cnf.xml due to inconsistency

Modern Cisco IP Phones (8800/7800 series) have moved to a more robust system. They use HTTPS for configuration download, signed XML files, and Device Enrollment over HTTP. The xmldefault.cnf.xml legacy has been replaced by ITL (Initial Trust List) and CTL (Certificate Trust List) files.

However, thousands of legacy 7900-series phones still run in warehouses, schools, and home labs. For those, the "repack" remains a lifeline.

The log indicates the Forced Firmware Synchronization feature is activating. The phone is using the default configuration to forcibly downgrade or change its internal software build to match what the TFTP server dictates as the "default."

This report outlines the technical process for managing the XMLDefault.cnf.xml

file, which is critical for the initial boot and firmware updates of Cisco IP Phones. 1. Purpose of XMLDefault.cnf.xml XMLDefault.cnf.xml

file serves as a global configuration fallback for Cisco IP phones. When a phone boots, it follows a specific "hunt algorithm": Primary Search

: The phone first requests a device-specific configuration based on its MAC address (e.g., SEP.cnf.xml Fallback Search

: If the specific file is not found (often for new or unregistered phones), the phone requests XMLDefault.cnf.xml

: This file provides the phone with the IP address and port of the Call Manager for registration and specifies the correct firmware load name for each phone model. 2. Downloading the File

To modify or "repack" the default configuration, you must first obtain the current version from your Cisco Unified Communications Manager (CUCM) or Cisco Unity Express (CME) TFTP server. Method 1: Windows Command Line cisco ip phone downloading xmldefault cnf xml repack

You can use the native TFTP client in Windows. Ensure "TFTP Client" is enabled in Windows Features. Open a command prompt. Execute the following command: tftp -i get XMLDefault.cnf.xml Method 2: Browser Download

Directly access the file via the TFTP server's HTTP port (usually 6970):

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

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.cnf.xml The Fallback: If the specific file isn't found, it requests XMLDefault.cnf.xml 2. Common Root Causes

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: The repack process is an automatic healing mechanism

Access the phone's web interface (if enabled) to see exactly which file is failing to download. Verify MAC Address:

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?

The XMLDefault.cnf.xml file is a critical default configuration file used by Cisco IP phones during their registration and firmware update processes. It acts as a fallback when a phone does not have a device-specific configuration file. Purpose and Role in Registration

When a Cisco IP phone boots, it follows a specific sequence to find its configuration:

Device-Specific Search: The phone first attempts to download SEP.cnf.xml from the TFTP server.

Fallback to Default: If the specific file is not found, the phone requests XMLDefault.cnf.xml.

Key Instructions: This default file provides the phone with essential information, including:

The IP address and Port for registration (e.g., SCCP or SIP messages).

The Firmware Load ID, which specifies the required software version the phone should run. Downloading the XMLDefault File Modern Cisco IP Phones (8800/7800 series) have moved

You can retrieve the XMLDefault.cnf.xml file from a Cisco Unified Communications Manager (CUCM) TFTP server for analysis or modification. Using Windows CLI: Enable the TFTP Client in Windows Features.

Open the command prompt and run:tftp -i get XMLDefault.cnf.xml. Using Third-Party Tools:

Tools like Tftpd32 or Tftpd64 can be used by selecting the "TFTP Client" tab, entering the CUCM host IP, and requesting the file. "Repacking" or Modifying the File

"Repacking" in this context typically refers to modifying the XML file to point a phone to new firmware when a full CUCM environment is unavailable.

Firmware Association: Open the downloaded XMLDefault.cnf.xml with a text editor. Locate the tag corresponding to your phone model (e.g., ) and update the tag with the exact name of the new firmware load file (the .loads file).

Deployment: Place the modified XML file and the unzipped firmware binaries (downloaded as a .zip from Cisco Support) into the root directory of your local TFTP server.

Execution: Configure the IP phone to use your local computer's IP as its "Alternate TFTP" server and restart the phone to trigger the download. Important Considerations 8861 software upgrading error - Cisco Community

If the file is corrupted or missing, you can manually repack (recreate and re-upload) XMLDefault.cnf.xml on the CUCM TFTP server.

Environment: CUCM 12.5, 200 phones (mostly 8845).
Symptom: Every morning at 8 AM, 30 phones reboot and fail to register, logs show "repack XMLDefault.cnf.xml".
Investigation: TFTP server CPU was 100% due to a backup job running simultaneously.
Root cause: TFTP service timed out while reading phone-specific files → served fallback → found default file outdated → repacked.
Resolution: Rescheduled backup, increased TFTP cache timeout, and synced all configs. The repack messages disappeared.

If your Cisco IP Phone is stuck "Downloading xmldefault.cnf.xml" and you suspect a repack issue, follow this checklist: