T48 S/G SfB Questions

[TrackRight]

Hoping someone can help with some questions. I have a client wanting to move to SfB down the track but needs some phones now.

Thinking of T48 S/G SfB however, three small (probably dumb) questions:
- What's the difference between these two?
- Can they connect to an existing FreePBX server as current phones do instead/as well as SfB to make calls via existing ISDN lines?
- I can't see a bulk config tool like there is for the non SfB phones, or do you just use the one for the non-SfB version of the phone?

Thanks in advance,
Rod