PLANET UMG-1000 - Manual (Page 107)

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(4)Go to “GSM Dialplan” page.
(5)Select “GSM Dial Termination Key”.
(6)Set the prefix number for choose GSM Line outside call.
Example. We use prefix number “09” for choose GSM Line outside call.
(7)After setting complete, press the “Apply” button and click the “Save Confighuration”.
Step4.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 for PSTN Line and GSM Line.