1. 7931 is supported
2. 8 users with 8 mailboxes included.
3. 7925 is supported on the UC540
4. WIFI on the UC540 can be used for voice and data. Only one SSID can be broadcast at one time.
5. You can use the 2960 POE switch, or you can use the Small Business series ESW switches. If you use ESW, you can configure the switches and UC560 all in CCA.
6. The UC540 has Hunt groups, Blast Groups, Auto Attendant, and Basic ACD. You cannot link a IPCC express to the UC540.
Regards,
Adam Compton