Cisco IP phones (e.g., 78xx, 88xx series) request XMLDefault.cnf.xml from a provisioning server when no device-specific file exists. This XML file defines parameters such as:
Replace 192.168.1.100 with your PBX/SIP server IP. cisco ip phone downloading xmldefault cnf xml repack
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 Root cause: TFTP service timed out while reading phone-specific files → served fallback → found default file outdated → repacked.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. Cisco IP phones (e
: If the TFTP server returns a "File Not Found" error for the unique MAC-based file, the phone falls back to requesting the XMLDefault.cnf.xml . Symptom: Every morning at 8 AM, 30 phones