Design Guide

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
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Disable SCEP enrollment challenge password requirement via regedit by setting EnforcePassword to 0.
(HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Cryptography > MSCEP > EnforcePassword)
SCEP uses the certificate template that is set in the registry for issuing certificates.
(HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Cryptography > MSCEP)