If you wish to check FPL voicemail AND retain OBi Blind Transfer capability, it will be necessary to map check FPL voicemail to something else, say *88. Assuming FPL is configured on SP2/ITSP Profile B:
Service Providers -> ITSP Profile B -> General -> DigitMap : (<*88:cfv>|<cfv:*98>|...)
To use Blind Transfer, press the FLASH button while on a call. When you hear a new dialtone, dial *98 and wait for a prompt tone. Then dial the number you wish the call to be transferred to, followed by a #. When you hear the confirmation tone, hang up.