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:
Or via CLI:
When you see "Downloading xmldefault.cnf.xml," the phone has:
For a Cisco IP phone, XMLDefault.cnf.xml is the default configuration file it first requests from a TFTP server. It acts as the initial instruction manual, providing a basic set of parameters the phone needs to start communicating with a Cisco Unified Communications Manager (CUCM) or a similar call control system. cisco ip phone downloading xmldefault cnf xml repack
Using a tool like tcpdump or looking at your TFTP daemon's live log output can reveal the exact sequence. For example, a typical failed boot sequence might look like this:
"Hey John, we have a problem," Mike said. "Our Cisco IP phones are not functioning properly. The users are complaining about not being able to access their voicemail and speed dials are not working."
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Cisco does not officially distribute stand-alone xmldefault.cnf.xml files because they are generated dynamically by CUCM. However, the community has reverse-engineered the file structure. A "repack" typically includes:
You can create a file named XMLDefault.cnf.xml using a text editor. It must include a tag for your model.
Access your DHCP server and verify that Option 150 points to the correct active TFTP subscriber node. Using a tool like tcpdump or looking at
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 "Downloading xmldefault.cnf.xml" hang is almost always a . Ensure your TFTP server is reachable, your firmware files are physically present in the root directory, and your XML syntax is flawless.
When a Cisco IP Phone boots, it follows a strict sequence to obtain its configuration. If it gets stuck downloading XMLDefault.cnf.xml
utils service restart Cisco Tftp