Port being dropped on our firewall to RingCentral networks not on the firewall ports list

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http://success.ringcentral.com/articles/RC_Knowledge_Article/Ports-and-Firewalls

The above doc gives us a list of ports we need to open in the firewall. Looking at our logs however, I see all of our employee systems trying to connect to RingCentral networks on port UDP/3478 pretty consistently and it is being dropped. What is this port and is it something that should be allowed and added to this document?
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Robert Jerina

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Posted 3 years ago

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RC-Installer, Champion

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Hi Robert

Simple Traversal of UDP Through NAT (STUN) port. It operates on port 3478 tcp/udp. It is usually supported by newer VoIP devices. [RFC5389] [RFC5766] [RFC5780]
Apple FaceTime, Apple Game Center use ports 3478-3497 (UDP).

Thanks

Chuck
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Robert Jerina

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Thanks, Mike.
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Robert Jerina

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Any updates on this?
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Mike, Official Rep

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Hi Robert,  Sorry for the delay. We've had to do some research and verify info on our end. You should hear something before the day is over. thanks for your patience. 
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John Tran, QoS Network Analyst

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Hi Robert.  We apologized for the delay in response.  UDP ports 3478 and 3479, are legitimate ports being used by our RingCentral Meetings app.  Please do allow access to both ports in/out of your network as appropriate (and/or as needed).  We will be adding these two UDP-based ports to our requirements documentation going forward.  Thank you, again, for bringing up the matter.
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Robert Jerina

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OK. Thanks, John. We'll get these ports added into our firewall.

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