It was 3:47 AM in the server room. The only light came from the blinking port LEDs and the pale glow of a laptop screen. Jake, the night-shift voice engineer, had been staring at the same error for four hours.
“Phone is downloading xmldefault.cnf.xml.”
He slammed his coffee cup down. For the uninitiated, that message was boring. For Jake, it was the sound of a silent apocalypse.
Every Cisco IP Phone in the corporate HQ—all 1,200 of them—was ignoring their specific configurations. Instead of pulling SEPABCD123456.cnf.xml (their unique file), they were all falling back to the generic xmldefault.cnf.xml.
The result? Receptionists had the CEO’s direct line. The CFO’s phone was showing the breakroom extension. And the IT helpdesk number just routed to the vending machine on floor 3.
“The repack,” Jake whispered.
Earlier that day, his lazy coworker, Mark, had tried to “optimize” the TFTP server. To save space, Mark had deleted all the individual phone configs and created a single “repack” of the default XML file, thinking the phones would just “figure it out.”
They did not figure it out.
Jake cracked his knuckles. He opened WinSCP and navigated to /tftpboot/. There it was: xmlDefault.cnf.xml. He right-clicked. Edit.
Inside was Mark’s “efficient” script:
<device>
<line instance="1">
<callerId>WRONG NUMBER</callerId>
<voicemail>999</voicemail>
</line>
</device>
“Idiot,” Jake muttered. He didn’t have the original backup. The RAID had failed last Tuesday, and Mark “forgot” to check the logs.
So Jake did the unthinkable. He performed a manual repack.
He opened a second terminal and ran a packet capture. Every time a phone requested its MAC config, he replied with a custom-built XML payload injected from a Python script.
Phone by phone. Office by office.
At 5:00 AM, the night janitor watched as Jake ran down the hallway, laptop in hand, Ethernet cable trailing behind him like a tail. He plugged directly into a Cisco 7965 that was blinking “Config Failed.”
He hit Enter.
The phone screen flickered. For three seconds, it showed “Contacting DHCP.” Then, a miracle.
It rebooted. The line buttons lit up green. The display read: Jake S. – Ext. 1042.
He didn’t stop. He ran to the next floor.
By 7:55 AM, just as the first executives arrived, the last phone—the lobby concierge—dinged cheerfully.
Jake slumped against the wall. On his screen, the TFTP log showed the final success:
FILE REQUEST: SEP006B8E5C2A12.cnf.xml – STATUS: REPACK SUCCESS
Mark walked in at 8:02 AM with a latte.
“Hey, did you fix that little XML thing?”
Jake looked up. He smiled, unplugged his laptop, and walked to HR.
The phones never downloaded xmldefault.cnf.xml again. Because Jake repacked his resume instead.
The message "Downloading XMLDefault.cnf.xml" appears when a Cisco IP phone cannot find its specific configuration file (e.g., SEP) and falls back to the generic default file to find a registration server or firmware. If it hangs there, it's usually because the TFTP server is unreachable or the file itself is missing or corrupt.
Here is a story of a typical Tuesday in the life of a Network Admin facing this exact issue.
The server room hummed with its usual low-frequency buzz, a sound that usually meant everything was fine. But on Mark’s desk sat a brand-new Cisco 7960, its screen staring back with a stubborn, frozen message: "Downloading XMLDefault.cnf.xml."
Mark sighed. He had just unboxed ten of these for the new marketing suite. The first nine had registered instantly, pulling their SEP files from the Cisco CallManager like hungry fledglings. But Phone Number Ten was different. It had bypassed its specific config and gone straight for the "backup plan"—the XMLDefault.cnf.xml—and now it was stuck in a loop.
He knew the "repack" process was the next step. If the phone couldn't get the file, he’d have to manually grab it from the TFTP server, "repack" it with the correct firmware load information, and feed it back to the phone.
Mark opened a command prompt on his laptop. He typed the TFTP get command to pull the file manually:tftp -i 10.1.1.1 GET XMLDefault.cnf.xml Transfer successful. CSCtg22649 - SCCP IP Phones are unable to ... - Cisco Bug
The message "Downloading XMLDefault.cnf.xml" on a Cisco IP phone is the digital equivalent of a "hail mary." It indicates that the phone has failed to find its specific identity—the SEP file—and is now reaching out to the TFTP server for a generic, cluster-wide instruction set. The Digital Handshake: Why It Happens cisco ip phone downloading xmldefault cnf xml repack
When a Cisco phone boots, it follows a strict DORA process (Discovery, Offer, Request, Acknowledgement) via DHCP to find its TFTP server. Once connected, the sequence is:
Identity Check: The phone asks for its unique configuration file (SEP).
The Fallback: If the server returns a "File Not Found" error, the phone doesn't give up. It requests XMLDefault.cnf.xml.
The Master Key: This default file tells the phone three critical things: Which firmware version (Load ID) it should be running.
Which Unified Communications Manager (CUCM) cluster it belongs to. Whether Auto-Registration is allowed. When the Phone Gets Stuck
If your screen is perpetually looping on this message, it usually signals a breakdown in the TFTP conversation. Common culprits include:
Update Cisco IP Phone Firmware through Third-Party TFTP Server
Here’s a concise review of that phrase and suggested clarification/alternatives.
Issues with original:
Improved, explicit variants (choose one based on intent):
If you want a search-friendly phrase:
If you want an instruction (download + repackage):
If you want a filename-focused query:
If you want a troubleshooting/title:
Suggested brief description to accompany a post or ticket:
If you tell me which intent fits (search, command, how-to, bug report), I’ll convert to a final title or write a short how-to.
[Invoking related search suggestions for people/places/terms]
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
: 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
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
Directly access the file via the TFTP server's HTTP port (usually 6970):
Troubleshooting Cisco IP Phone Stuck at "Downloading xmldefault.cnf.xml"
If you are seeing your Cisco IP Phone—whether it’s an older 7940/7960 series or a newer 8800 series—stuck on the message "Downloading xmldefault.cnf.xml," you are witnessing a classic TFTP boot-loop.
This error typically indicates that the phone has successfully grabbed an IP address via DHCP but is failing to retrieve its configuration files from the TFTP server. Below is a deep dive into why this happens and how to "repack" your configuration strategy to fix it. 1. Understanding the Boot Process
When a Cisco IP Phone boots, it follows a very specific "phone-home" sequence:
DHCP Request: The phone asks for an IP, subnet, and Gateway.
Option 150/66: The DHCP server provides the IP address of the TFTP server. CTL/ITL Files: The phone looks for security tokens. It was 3:47 AM in the server room
xmldefault.cnf.xml: If the phone doesn't have a specific configuration for its MAC address yet, it asks for this generic "Global" default file.
SEP[MAC].cnf.xml: The phone looks for its unique configuration file.
If the phone hangs at "Downloading xmldefault.cnf.xml," it means the phone knows where to look (the TFTP server is identified), but it cannot pull the data. 2. Common Culprits The TFTP Service is Down
On Cisco Unified Communications Manager (CUCM), ensure the Cisco Tftp service is running under Servicability. If you are using a third-party tool like TFTPD64, ensure the application is open and the directory path is correct. Firmware Mismatch (The "Repack" Need)
Often, the xmldefault.cnf.xml contains the instruction for which firmware the phone should be running. If you are trying to "repack" or upgrade your phone system, and the firmware files listed in the XML are missing from the TFTP directory, the phone will hang indefinitely. Network Access Control (ACLs) & Firewalls
TFTP uses UDP Port 69. If you have a voice VLAN, ensure there isn't an ACL blocking the phone from reaching the CUCM or TFTP server on this port. 3. How to "Repack" Your Configuration
If you are manually managing a TFTP server (outside of CUCM), you must ensure your XML file is formatted perfectly. A single missing bracket will cause the phone to reject the file. Step 1: Verify the XML Structure
Open your xmldefault.cnf.xml in a code editor. Ensure the cmterm-88xx-sip.12-5-1SR1-04.k3.cop.sgn) without the extension. Step 2: Check File Permissions
On Linux-based TFTP servers, the file must be world-readable. Use chmod 777 (for testing) to rule out permission errors. Step 3: Clear the Phone Cache
If the phone is stuck due to a corrupted "Trust List," you may need to perform a factory reset: Unplug the phone. Hold the # key while plugging it back in. When the light strips flash, dial 123456789*0#. 4. Solving the "Direct Download" Fail
If the phone simply won't pull the file, try these "repack" tips:
Case Sensitivity: Cisco phones are extremely picky. XMLDefault.cnf.xml is not the same as xmldefault.cnf.xml. Always use lowercase.
The "Empty File" Trick: Sometimes, creating a completely blank text file named xmldefault.cnf.xml allows the phone to bypass the global check and move straight to requesting its specific SEP[MAC].cnf.xml.
Option 150 Verification: Ensure your DHCP server isn't pointing to an old, decommissioned TFTP server.
The "Downloading xmldefault.cnf.xml" hang is almost always a communication or file-existence issue. Ensure your TFTP server is reachable, your firmware files are physically present in the root directory, and your XML syntax is flawless.
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.
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:
The IT Hero's Quest for the Perfect Phone Configuration
It was a typical Monday morning for John, a network administrator at a large corporation. He was sipping his coffee and checking his emails when his phone rang. It was his colleague, Mike, from the IT department.
"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."
John knew that the Cisco IP phones were configured using an XML configuration file, specifically the xmlDefault.cnf.xml file. He also knew that the file was used to push settings and configurations to the phones.
"Have you checked the XML file?" John asked Mike.
"Yeah, we've checked it, but it seems fine," Mike replied. "We've also tried restarting the phones and the Cisco Unified Communications Manager (CUCM), but nothing seems to be working."
John thought for a moment and then said, "I think I know what the problem might be. The XML file might be corrupted or not formatted correctly. We need to re-generate the file and re-push it to the phones."
Mike asked, "But how do we do that?"
John explained that they needed to use the Cisco Unified Communications Manager's (CUCM) built-in feature to generate a new xmlDefault.cnf.xml file. They would then need to re-package the file and push it to the phones.
The two IT colleagues quickly got to work. They logged into the CUCM and navigated to the "Device" > "Device Settings" > "Default Device Configuration" page. From there, they selected the "Generate XML" option to create a new xmlDefault.cnf.xml file.
Once the file was generated, they used a tool to re-package it into a format that the phones could understand. They then uploaded the re-packaged file to the CUCM and set it as the default configuration file for the phones. “Idiot,” Jake muttered
The next step was to force the phones to download the new configuration file. John and Mike used the CUCM's "Device" > "Phone" page to select the phones that needed the update and then chose the "Reset" option to restart the phones.
After a few minutes, the phones had restarted and the users began to report that their voicemail and speed dials were working again.
John and Mike breathed a sigh of relief, happy that they had resolved the issue. John said, "I'm glad we were able to get the phones working again. It's amazing how a simple XML configuration file can cause so much trouble if it's not formatted correctly."
Mike nodded in agreement. "Definitely. But now we know how to troubleshoot and fix the issue. And we have a good story to tell about the time we saved the day with a little XML magic."
From that day on, John and Mike were known as the IT heroes who had saved the company's phone system from certain doom. And they never forgot the importance of a well-formatted xmlDefault.cnf.xml file.
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
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 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
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 . 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., .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
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.
file delete tftp:/*.xml (careful) or reboot CUCM node.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.
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.