You need to pass by 8.1 or 9 before going to 9.1 for IPOffice.But for the Voicemail pro on windows or Linux UCmodule you can go straight.
You need your upgrade licence in the system before proceeding.
Passing from 7 to 9 will take you around an hour 15 min and from 9 to 9.1 an other hour and half.
I did one a month ago and it went well but i was not able to restore the voicemail with my version 7 back up.I had to reinstall the ucmodule with a a usb and rebuilt it from scratch.
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