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

Go to "Door System Settings  Basic Settings" then set the following:
1. Doorbell Mode set to "Call Doorbell Number".
2. (optional) Door Bell Call Mode: When using multiple phones. Please, refer to "Door Bell
Call Mode"
3. Number Called When Door Bell Pressed (assuming 1001 is the WP820 number).
4. Remote PIN to Open the Door.
The following figure shows an example of the configuration done.

Figure 7: SIP Basic Settings

Figure 8: Door System Settings

Connecting GDS3710 with WP820 Configuration Guide
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