Re: Why do IP phones/CallManager go out on port 2000 on data gat
Port 2000 is used by the skinny protocol. This enables the phones to communicate with Call Manager. The protocol enables Call Manager to control the IP phones in a nutshell.
Check your network setup and addressing. The only reason I can think of for your firewall to see traffic on that port through the gateway is if the phones are trying to send out requests through the firewall to a ficitious Call Manager. Obviously, the fact that the phones still work means that they are on the same network with the call manager. Therefore, traffic on port 2000 should not need to cross the firewall. Do you have multiple sites separated by the firewall?
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