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When the Clients meets same meeting in One NAT IP
Because we use a closed internal network, we're seen externally with a single NAT IP. We have confirmed that the connection is not good when a few users currently use the internal network connect to ...
heungall Teams doesn't use that many, but you do need to think of all the other applications that use them. Outlook can commonly have 3-10 connections, each web site that a client has open can have a connection, and then Teams can have some connections.
A single IP can provide about 60,000 connections (each connection uses a different port). which means that around 5,000 users can wipe out a NAT pool. Your router should be able to support multiple IP addresses assigned to a NAT pool, of course that means that you have multiple external IP addresses available.