SM_user,
The CAT F license is for the MiVO-250; it is for SIP Devices.
The Softphone License would be for the Phone Manager Server if you don't already have the softphone licensing available to create the SIP Softphone.
If the SIP Softphone already exists on the Phone Manager then you won't need that or the CAT F license as it would already have one for the SIP Softphone to be able to work.
So, the logical thinking is that if you don't have the CAT F license then most likely you don't have the Phone Manager Softphone license either, but that isn't always the case.
Thanks,
TE