PLANET UMG-2000 - Manual (Page 117)

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Step3.
Input the Username, password..., and modify the “Extension” number you want.
After setting complete, please press the “Apply” to apply the configure.
*** Use VIP-281GS to register to UMG-2000：
Step1.Configuration VoIP Setting register to UMG-2000：
(3) Select the “Advance Setup”.
(4) Go to “VoIP Basic” page, and “VoIP Protocol Setting” select “SIP”.
(5) Register FXS and GSM on the UMG-2000.
Key-in the UMG-2000 extension number and password.
(the default extension password same as extension number)