To configure reserved ports via web user interface:
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Click on Network->Advanced.
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Enter the desired UDP port scope in the UDP Port Scope field.
Make sure the port range consists of 20 ports for proper functioning of the IP phone.
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Enter the desired TCP port scope in the TCP Port Scope field.
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Click Confirm to save the change.
A dialog box pops up to prompt that settings will take effect after a reboot.
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Click OK to reboot the phone.
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Matrix SPARSH VP710 User Guide