IP Phones firmware during call manager upgrade

Unanswered Question
Apr 22nd, 2008
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I am going to do an upgrade from 4.0(2a) to 4.3(2a).

Since, number of IP Phones are huge, around(1800) for receiving new firmware after upgrade.This will take lot of time.

Q.Can I use the old firmware of phones with old CCM-4.0(2a) so that IP Phones don't download the new firmware.

Q.How to use the old image?

Q.Does this have any side effects on the IP Phones.

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