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.
: If the specific file is not found (often for new or unregistered phones), the phone requests XMLDefault.cnf.xml cisco ip phone downloading xmldefault cnf xml repack
Keywords: Cisco IP Phone, XMLDefault.cnf.xml, CUCM TFTP, repack config, SCCP fallback He opened a second terminal and ran a packet capture