Follow these steps in sequence to isolate and fix the provisioning loop. Step 1: Verify DHCP Option 150
After editing the configuration file, you need to force the phone to download the new version.
Verify that the string matches the exact case and character layout of the firmware files residing on your TFTP path. Step 5: Restart the Cisco TFTP Service
ip dhcp pool PHONE_POOL network 192.168.10.0 255.255.255.0 default-router 192.168.10.1 option 150 ip 192.168.10.250 <-- IP of your TFTP/CUCM Server Use code with caution. Step 2: Test TFTP File Availability
If you are using a third-party TFTP server (like Tftpd64), an asterisk-based PBX (FreePBX), or need to manually upload files to a flash directory, you must safely unpack and repack the Cisco software files. Understanding Cisco Firmware Packages Cisco provides firmware in two formats: cisco ip phone downloading xmldefault cnf xml repack
You can verify what the TFTP server is broadcasting by downloading the file from a computer on the same voice VLAN. Open a command prompt/terminal on your PC. Run the TFTP fetch command: tftp -i [TFTP_Server_IP] GET xmldefault.cnf.xml Use code with caution.
Upload the modified XMLDefault.cnf.xml , individual device configuration files ( SEP[MAC].cnf.xml ), and all extracted firmware binaries directly into the root directory or designated path of your TFTP server (e.g., /var/lib/tftpboot/ ). Step 5: Set Permissions (Linux Servers)
: The phone looks for DHCP Option 150 (or Option 66) to find the TFTP server IP address.
SCCP45.9-4-2-1S Use code with caution.
According to official Cisco documentation, a phone requests this default file when is enabled in Cisco Unified Communications Manager (CUCM) and the phone has not yet been added to the database or is registering for the first time.
Linux-based TFTP servers treat cmterm-78xx.LOADS and cmterm-78xx.loads as completely different files. Repacking ensures all filenames match the exact case specified inside the XML configuration text. Step-by-Step Guide to Repack and Deploy Files
: Newer phones (firmware 9.x and later) may bypass XMLDefault.cnf.xml if specific load information is already cached or hardcoded.
Extract all contents of the firmware zip file directly into the root directory of your TFTP server. Follow these steps in sequence to isolate and
You should see a confirmation like "Transfer successful: 7332 bytes in 1 second, 7332 bytes/s".
Locate the service and click Restart . (Note: Restarting the TFTP service does not drop active calls, but it will prevent active phones from downloading configuration changes or upgrading until the service comes back online in 1–2 minutes). Best Practices for Future Firmware Repacks
From a working phone of the same model:
Log into your . Navigate to Trace & Log Central > Collect Files . Select Cisco TFTP logs. Step 5: Restart the Cisco TFTP Service ip
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