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.