Now for use of IBM Chat it is necessary to deploying infrastructure of IBM Sametime - the servers Community, Console, Proxy, DB2. Here at a forum I already saw many ideas to simplify or refuse it.
I see of a wish 90% my users. They want to use Verse Mobile for mail and the calendar, and also corporate chat with a possibility of file transfer without meetings (no audio and video striming).
As option, I suggest to add the application call Verse Chat which will be authorized with the Traveler server and use APNS and GCM for a chat. Further the Traveler server works with internal Sametime Community using protocol VP and Derby DB or MSSQL/DB2 in HA option for storage.
Such option can be worked for licensing of Sametime Limited Use also.