The OBi200 plus OBiLINE can do everything (and more) that the OBi110 could do before the recent GV change. However there are reports that the OBiLINE's performance is not on a par with that of the OBi110. And I am under the impression that the OBiLINE is a discontinued product.
You have several options:
1. Get an OBi200 and an ObiLINE.
2. Get yourself on the "wait list" for the Simonics GV Gateway and use that to restore GV connectivity to your OBi110.
3. Wait until the OBi212 becomes available wherever you are. That is effectively the 200 series version of the 110.
4. Get an OBi200 and use both it and your OBi110. The 200 for GV and the 110 to service the landline. It is not difficult to route calls between the two to give you the functionality you previously had.
https://www.obitalk.com/forum/index.php?topic=13136.msg84343#msg84343