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How to configure DID in Grandstream GXP1620/1625 models please help us

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ssvc

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How to configure DID in Grandstream GXP1620/1625 models please help us
 
Hello,

Please start from here to first setup your phones, and make sure they can call each other's extension
https://www.3cx.com/sip-phones/grandstream-gxp16-series/

Hi Sir, Thank you for your prompt reply, We are unable to configure the Physical phone using the link which you provided, phones are not registering. there is one setting not showing for me when i tried to setup (attached and highlighted in color Yellow). please help us on this.
 

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  • 3cX settings.png
    3cX settings.png
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Hi Sir, I have done exactly as mentioned in the link, still device is not registering Can you please suggest.
 

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  • gxp 1620 -2.png
    gxp 1620 -2.png
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  • GXP1620-1.png
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  • GXP1620-3.png
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Please find the updated firmware version of the phone.
 

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  • gxp 1620 after firmware update.png
    gxp 1620 after firmware update.png
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