This is what tech bulletin 80 says
2.6 Avaya IP Office Telephone Support
IP Office release 4.0 will remove support for certain models of telephones. No longer supporting a phone does not necessarily mean that its use is explicitly prohibited or that code supporting the telephone has been removed, but no longer supporting a phone means it has not been tested and reported bugs will no longer be resolved.
IP Office 4.0 will support the following telephone sets (pending regional availability):
• 2400/5400 series digital phones
• 4600/5600 series IP phones
• 4406, 4412, 4424D+ sets (to provide MERLIN MAGIX migration)
• 6400 series sets (no longer sold new)
• T3 IP and T3 digital (not supported on IP Office Small Office Edition)
• 3701/3711 (IP DECT)
• 3616/3620/3626 (WiFi)
• 3810 (900MHz)
• Analog phones
• Associated DSS units (e.g. EU24)
IP Office 4.0 will NOT support the following sets:
• 20xx (INDeX DT)
• 20DT Analog Kirk DECT (unless IP DECT GAP)
• 4606, 4612, 4624
• TransTalk 9040
ACA - Implement IP Office
ACA - Voice Services Management
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Women and cats can do as they please and men and dogs should relax and get used to the idea!