Is Ringcentral supporting federation (presence and IM) with external platform like Skype For Business or Jabber over XMPP or SIP/SIMPLE?
I am not aware of such a feature. I could say that it is not supported.
Its a pity, I think there would be some interest
AFAIK it's not currently supported but the work on this feature is already underway and, if I'm not mistaken, the testing of it should start in this coming quarter. I'm a newbie (joined this Monday) so take this with a grain of salt. There's plenty of material on wiki already. Have a look at this page, for example: https://wiki.ringcentral.com/pages/viewpage.action?pageId=217917564
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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