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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.
Key sections to modify:
He slammed his coffee cup down. For the uninitiated, that message was boring. For Jake, it was the sound of a silent apocalypse. cisco ip phone downloading xmldefault cnf xml repack
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Root cause: TFTP service timed out while reading phone-specific files → served fallback → found default file outdated → repacked.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.
The phone will download XMLDefault.cnf.xml, realize it needs a specific SEP file, download that, and then register. The message "Downloading XMLDefault
Cisco uses AES-128-CBC with a fixed key derived from the phone model (e.g., STKey for 78xx). Tools like cisco-xml-decrypt or OpenSSL can decrypt:
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 For the uninitiated, that message was boring
After a few minutes, the phones had restarted and the users began to report that their voicemail and speed dials were working again.
If a phone is stuck "Downloading XMLDefault.cnf.xml," it usually indicates a breakdown in the TFTP communication or a configuration mismatch: IP Phone, SCCP & SIP Phone Registration Process with CUCM