Cisco Ip Phone Downloading Xmldefault Cnf Xml Repack

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:

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. cisco ip phone downloading xmldefault cnf xml repack

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:

Cisco phones can run either SCCP (Skinny) or SIP firmware. If you use a SIP repack on an SCCP phone, you will see "Downloading xmldefault.cnf.xml" followed by "Error: Invalid XML parse" and a reboot loop. Still stuck

Solution: Re-flash the phone with the correct firmware type before applying the repack. For the 7940/7960 series, this requires a special .bin load.

If repacking fails, force the phone to skip default: Look for:

Once registered, it will download its own SEP<MAC>.cnf.xml and never request the default again.