OBi110: In addition to the FXS (PHONE) port, it has an FXO (LINE) Port.
OBi100: Has an FXS (PHONE) port only -- ETA March.
Both products are useful in their own right and have a long life ahead of them.
(Please keep checking Amazon for stock availability as new shipment quantities are are being checked in to inventory throughout the day ... and days ahead).
We noticed there are a lot of people watching this Slickdeals.net thread
who are also watching Amazon for stock availability.