Figure 7: Configuring Gds Opendoor Mpk - Grandstream Networks GS-GXP1610 User Manual

Figure 7: Configuring GDS OpenDoor MPK

The GDS device must be properly configured as well by enabling "Remote PIN To Open Door" under
GDS web UI  Door System Settings  Basic Settings.
When the phone is in idle state, pressing the configured MPK or Line key will open the door via GDS.
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GXP16XX User Guide
Version 1.0.7.18