PLANET UMG-1000 - Manual (Page 106)

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(6)Go to “System Administration” page.
(7)Go to “System Information” for check your GSM is success connect.
Step3. Configuration the prefix number for auto select PSTN Line or GSM Line when
had outside call：
(1)Go to “PSTN Dialplan” page.
(2)Set the prefix number for choose PSTN Line outside call.
Example. We use prefix number “2” for choose PSTN Line outside call.
(3)After setting complete, press the “Apply” button and click the “Save Confighuration”.