ATCOM 5520 User Manual page 30

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Active IP： IP phone's address.
Current Net mask：network net mask.
MAC Address：MAC of IP phone.
Current Gateway：the IP address of the router.
B、If your ISP provide you with the fixed IP address, please choose static and fill
in the correct information of IP Address、Net mask、Gateway、Primary DNS etc.
If you do not know it please refer to your ISP provider or network management
stuff. The reference picture is as below.
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