PLANET UMG-2000 - Manual (Page 114)

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If your setting is correct, you will see the “Register” information at UMG-2000.
Step2. Configuration Hotline for when outside call in to forward extension number：
(1)Go to “Hot Line Setting” page.
(2)Set you want to forward to extension number which port you plug the PSTN Line.
After setting complete：
(1)when call form outside, that will forward to your extension number 5000.