Why is RingCentral for Mac trying to access pubsub.pubnub.com?

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I use Little Snitch to monitor network activity on my Mac -- it reports that the RingCentral for Mac application tries to access pubsub.pubnub.com ( -- which is actually a system in AWS cloud) on port 80.

Does anyone know why it's doing this?  I can't find anything on the RingCentral website except for some references to pubnub embedded in the HTML of one page.
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Jeff Frontz

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Posted 3 years ago

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Mike, Official Rep

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Official Response
I confirmed with our Tier 3 engineers that this is legitimate.


Pubnub is the 3rd party vendor we use for HUD updates on the softphone. This applies not only to the MAC version but the Windows version of the desktop app as well. So, the traffic seen going to and from their servers is for that specific feature.




Tier 3 Support Engineer