Grandstream GDS3705 IP Audio Door System with RFID

The Grandstream GDS3705 IP Audio Door System is built around one practical benefit: bringing visitor communication and controlled entry into the same networked doorway device. A facilities team can use its metal keypad and EM4100 RFID reader at the entrance, while SIP support connects the door station to the site’s voice workflow. Integrated dual microphones capture speech from up to 1.5 m, and the 2 W HD loudspeaker projects audio up to 3 m, helping visitors and staff communicate without a separate handset at the door. Two relay outputs and two optocoupler inputs give installers the control points needed to connect the doorway to surrounding access equipment. This makes GDS3705 a focused choice for sites that prioritize audio verification, credential entry, and network-based control at one entrance.

How the Grandstream GDS3705 IP Audio Door System works

In daily operation, the unit serves as the first interaction point at an entrance. Its keypad has 12+1 metal keys with blue LED backlighting, providing a clear input surface for visitors and a physical interface suited to repeated use. The RFID reader uses EM4100 at 125 kHz, with up to 2,000 IDs recommended. That capacity suits sites that issue credentials to employees or registered users while keeping voice communication available for guests, suppliers, and maintenance contractors. The site manager can design an entry process around the appropriate credential method and retain a human conversation path without placing separate devices around the doorway.

GDS3705 supports SIP voice communication with G.711 mu/a-law and G.722 codecs. It can therefore operate as a network voice endpoint within the site’s configured SIP call flow. DTMF is supported through RFC2833 and SIP INFO, an important detail when planning a control process that uses tone commands during a call. AEC and ANC handle echo and ambient noise during conversation. For an operations manager, this means the assessment goes beyond whether the unit has a microphone and speaker; it also covers how the entrance joins the voice network and how the audio path is processed in the conditions around the doorway.

Door control and access-system connections

The device provides 2 optocoupler inputs with Vin below 15 V and 2 relays that support NO and NC operation. Each relay is rated for 125 VAC/0.5 A or 30 VDC/2 A, allowing the project engineer to compare the connected control circuit with the published limits before wiring. Separating inputs from outputs helps when planning door-state signals, request controls, or other entrance components while keeping the final wiring decision aligned with the site’s circuit design. RS485 and Wiegand 26-bit input and output provide additional interface options when the door station needs to join access components that use those connections.

The practical value is the ability to shape the doorway around the facility’s access policy. Cards can serve routine users, the keypad can accept entry codes, and SIP audio can support cases that require a person to verify the visitor. The relays provide the control interface for carrying out the entry decision within their electrical ratings, while the inputs receive signals from equipment around the door. This arrangement gives security teams a process that is understandable to employees and visitors, and gives maintenance teams defined connection points that can be tested during commissioning.

Saudi facilities that fit the GDS3705

In office compounds, GDS3705 can serve an employee or service entrance where credential holders move through routinely and unregistered visitors still need a voice contact. In warehouses and logistics facilities, its metal interface, RFID reader, and keypad suit an entry point used by staff, drivers, and service contractors throughout the working day. Managed residential buildings and mixed-use properties can use the same combination at a gate or building entrance, linking visitor communication and access control to the SIP workflow chosen by the site team.

The unit also fits service entrances and perimeter access points at industrial facilities, where dust, changing weather, and frequent physical interaction matter to the selection. Its enclosure carries an IP66 rating under EN60529 and an IK09 impact rating under IEC62262. It operates from -30 °C to 60 °C and uses a vandal-resistant zinc-alloy metal casing. These properties help a project manager shortlist installation points with more confidence, while the final decision should still account for direct exposure, shading, cable routing, and the condition of the mounting surface during the site survey.

Positioning GDS3705 in the GDS37 family

When evaluating the GDS37 family, GDS3705 should be treated as an audio-focused entrance endpoint with credential controls at the door. Its selection case is not network access alone; it is the combination of SIP, dual microphones, an HD loudspeaker, the metal keypad, the EM4100 reader, and relay interfaces in one housing. This positioning fits a project that starts with three operational questions: how the security operator speaks with the arrival, how the user presents a credential, and how the entry decision reaches the door circuit. GDS3705 brings those steps together at one mounting point and reduces the number of separate user interfaces the facilities team must operate and maintain.

This positioning is useful while defining the project scope. A facilities manager can separate the decisions cleanly: choose the user credential process, assign the SIP call destination, review the relay load, and select an expansion interface if the design requires one. The unit supports both wall-surface and in-wall mounting, so it does not force a single installation style. The designer can place it on an existing surface or integrate it more closely into the entrance finish, depending on the wall construction, cable route, available depth, and desired appearance.

Network, power, and installation notes

GDS3705 connects through a 10/100 Mbps auto-sensing network interface and supports IEEE 802.3af Class 3 PoE. Where the network infrastructure provides PoE, the same cable path can carry connectivity and power to the door location. For separate power, the device accepts 12 VDC / 1 A. The project must provide that supply when PoE is not used because an AC adapter is not included. Before installation, the network team should prepare the appropriate switch port, define the SIP settings, coordinate addressing with the site’s network policy, and plan testing at the actual doorway.

Physical dimensions depend on the mounting method. The in-wall installation dimensions are 217 x 120 x 11.6 mm, while the on-wall dimensions are 173 x 80 x 36 mm, and the unit weighs 0.635 kg. These measurements help the installer check the wall opening, clearance beside the door, recess depth, and cable exit before work begins. Commissioning should include checking microphone pickup within 1.5 m, speaker audibility within 3 m, keypad and credential operation, and input and relay response. With those checks completed, GDS3705 becomes a defined access-control and communication endpoint rather than simply another device fixed to the facade.

Package Contents

• GDS3705 unit
• Wiegand cable
• Installation bracket
• RFID card
• Drilling template
• Key fob
• Rubber gasket × 3
• Frame back cover
• Back panel screw × 6
• Quick Installation Guide
• Bracket screw and anchor × 6
• GPL License
• Anti-tamper screw × 4
• Anti-tamper hex key