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3550-24PWR and new IOS Versions

Has anyone else had serious issues with either of the new versions of Cisco IOS for the 3550-24PWR switches?

c3550-i9k2l2q3-tar.121-19.EA1c.tar

c3550-i9k2l2q3-tar.121-20.EA1.tar

When I run either of these any time a port goes up and down on a switch with IP Phones connected, they all unregister with CallManager. When I downgraded to c3550-i9k2l2q3-tar.121-19.EA1.tar everything works as expected. Can anyone think of anything I am missing here? I have opened a ticket on 121-20.EA1 but expected that 121-19.EA1c would be ok, yet it also exhibits the same problem.

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Re: 3550-24PWR and new IOS Versions

Looks like a bug - CSCeb10621. check this one

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