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Just read an Avaya product support notice ( Seriously affects adding any 1600 Series phones on any pre-Release 9.0 systems.
Basically 1600 series phones with 1.33/1.34 firmware don't react well to be downgraded to anything lower.
New phones from the factory come with 1.33. IP Office 9.0 shipped with 1.33 from GA so okay.
For other releases, the latest service packs for 8.1 and 8.0 have firmware 1.33 so best to upgrade. For anything earlier you'll need to manually replace the 1600 series bin files to a 1.33 set before adding/replacing any phones.
Stuck in a never ending cycle of file copying.
Basically 1600 series phones with 1.33/1.34 firmware don't react well to be downgraded to anything lower.
New phones from the factory come with 1.33. IP Office 9.0 shipped with 1.33 from GA so okay.
For other releases, the latest service packs for 8.1 and 8.0 have firmware 1.33 so best to upgrade. For anything earlier you'll need to manually replace the 1600 series bin files to a 1.33 set before adding/replacing any phones.
Stuck in a never ending cycle of file copying.