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upgrade cucm 4.1.3 to 7.1.3 PFS

Hi everybody

I have to upgrade CUCM 4.1.3 to 7.1.3.

All IP phones version are too old so I have to upgrade the firmware and I would like to do it after CUCM server are upgraded using PFS.

Is it possible to upgrade IP Phones using PFS after CUCM server are upgraded to 7.1.3 and with the old version of the ip phone ?

Thank you

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