Figure 7: Sip Basic Settings; Figure 8: Door System Settings - Grandstream Networks GDS3710 Configuration Manual

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Go to "Door System Settings > Basic Settings" then set the following:
The following figure shows an example of the configuration done.
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1. Doorbell Mode set to "Call Doorbell Number".
2. Number Called When Door Bell Pressed (assuming 1001 is the GXV3275 number).
3. Remote PIN to Open the Door.
Connecting GDS3710 with GXV32XX Configuration Guide

Figure 7: SIP Basic Settings

Figure 8: Door System Settings

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