Cisco Ip Phone Downloading Xmldefault Cnf — Xml Repack ((link))

Based on the log message "cisco ip phone downloading xmldefault cnf xml repack", the feature being described is Automatic Firmware Downgrade (or Repackaging) via TFTP.

Here is a breakdown of the feature and why this specific log appears: cisco ip phone downloading xmldefault cnf xml repack

3. Technical Breakdown of the Log

  • xmldefault cnf xml: The phone is using the Generic Default Configuration File. This usually happens when the phone is new (unprovisioned), has been factory reset, or is not recognized by the Call Manager (unregistered).
  • repack: This stands for Re-packaging. The phone is preparing its filesystem to accept a firmware image that is different from the one currently running. It is essentially formatting the flash partition to write the new (usually older) firmware.

What is XMLDefault.cnf.xml?

XMLDefault.cnf.xml is the default configuration file for Cisco SCCP (Skinny) phones. When a phone factory resets or cannot find its specific SEP<MACADDRESS>.cnf.xml file, it falls back to this global template. Based on the log message "cisco ip phone

  • SCCP Phones (7900 series, 6900 series) rely on this file.
  • SIP Phones use SIPDefault.cnf or SEP<MAC>.cnf.xml (less common for fallback).

When you see "Downloading xmldefault.cnf.xml," the phone has: xmldefault cnf xml : The phone is using

  1. Obtained an IP address.
  2. Found the TFTP server (CUCM).
  3. Requested its specific MAC-based config and failed.
  4. Fallen back to the default config.

8. Advanced: Manually Repacking XML Configuration

In some lab or recovery scenarios, you may need to repack manually. Cisco does not recommend manual editing, but you can force a rebuild:

  1. Stop TFTP service: utils service stop Cisco TFTP
  2. Navigate to /var/lib/tftp/ (Linux-based CUCM).
  3. Rename XMLDefault.cnf.xml to .old.
  4. Start TFTP service: utils service start Cisco TFTP → service repacks automatically.

3.3 Repack (Re-encrypt + Re-sign)

Repack steps:

  1. Edit the decrypted XML.
  2. Encrypt with same cipher and key.
  3. (Optional) Recompute MD5 checksum if required by phone.
  4. Serve via TFTP with correct MIME type (text/xml).
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