Subsonic Forum

Hope someone can help with some of my questions:

I am planning to use Subsonic as a an Audiobook streamer for multiple users.

1) Does Dsub (or the Subsonic official Android client) support bookmarking at server level or is the bookmark saved on the Android client?
2) Can the Subsonic server cast a track to Sonos from a specific bookmark?
3) Is there a way to bookmark from the Sonos client so to resume the track at a later time?

DSub saves bookmarks on the server but AFAIK it is the only client (including the web GUI) which supports the bookmarks. I believe they are saved per user. I have no idea about the sonos stuff though since I do not own/use Sonos at all.