Beeken,

I know this post is old, but I'm fighting an issue with this on a Cisco 3560. Our phones are on VLAN 10. I did what you said to do, but the phones still keep showing the following:

VER 4.09 z3.2.06
MAC: 00304dxxxxxx
CRC:21E9

We are having no luck, but I can ping the phone system all day on the vlan. The phones do not pick up an IP. Is there a way to get rid of this error correction code and statically assign an IP via a web gui or anything?