Grandstream GDS3702 HD Audio IP Intercom

The Grandstream GDS3702 is a slim audio-only door intercom for entrances where you need to speak to a caller and release the door, but a camera is either unnecessary or not permitted. At 173 x 80 x 36 mm on the wall it fits narrow door frames and mullions that a full video panel simply will not sit on.

It is a SIP endpoint, so a press of the call button can ring desk phones, DECT or Wi-Fi handsets, an indoor control station or a mobile app — no proprietary wiring and no dedicated answering panel required. Two onboard relays drive the lock and an alarm output, and two optocoupler inputs take an exit button and a door contact, so a complete door can be built around the unit itself. A single 802.3af PoE cable provides both power and network. The metal body is rated IP66 for weather and IK10 for impact.

Ideal for

• Narrow door frames and mullions where a wide video panel will not fit
• Sites where a camera at the door is not wanted for privacy reasons
• Rear entrances, fire exits and secondary doors on larger buildings
• Replacing analogue door entry handsets with SIP-based entry
• Warehouses, workshops and yards needing rugged outdoor entry
• Small offices and studios wanting door entry through existing IP phones

Key features

• SIP audio intercom — calls ring your existing IP phones, handsets or mobile app instead of a proprietary panel
• Two relay outputs — 125VAC/0.5A or 30VDC/2A, normally open or normally closed, for the lock and an alarm or light circuit
• Two alarm inputs — optocoupler inputs for a request-to-exit button and a door contact
• IP66 and IK10 rated — weatherproof and vandal-resistant metal casing
• Single-cable install — IEEE 802.3af Class 3 PoE carries power and data on one Cat5e run
• HD audio — G.722 wideband with a 2W loudspeaker effective to about 3 metres and a microphone pickup to about 1.5 metres
• Echo and noise handling — AEC and ANC keep speech intelligible in reverberant doorways
• Slim profile — just 36 mm deep on the wall, or flush-mounted with the in-wall option
• Wide temperature range — rated -30°C to 60°C for unprotected outdoor positions
• Remote provisioning — TR-069 and mass provisioning for multi-door rollouts

Technical specification

Audio

• Codecs: G.711µ/a-law, G.722
• DTMF: in-band, RFC2833 and SIP INFO
• Built-in microphone, pickup up to 1.5 metres
• Built-in HD loudspeaker, 2W, effective up to 3 metres
• Acoustic echo cancellation and noise cancellation

Network

• 10/100 Mbps auto-sensing Ethernet port
• SIP/VoIP with broad interoperability
• TR-069 local upload and mass provisioning

Inputs, outputs and power

• 2 x relay outputs: 125VAC/0.5A or 30VDC/2A, normally open or normally closed
• 2 x optocoupler alarm inputs, Vin under 15V, for door sensor or exit button
• PoE: IEEE 802.3af Class 3
• Alternative power: 12VDC / 1A (AC adapter not supplied)

Physical and environmental

• On-wall dimensions: 173 x 80 x 36 mm
• In-wall dimensions: 217 x 120 x 11.6 mm
• Weight: 672g
• Ingress protection: IP66 (EN60529)
• Impact resistance: IK10 (IEC62262)
• Operating temperature: -30°C to 60°C
• Humidity: 10% to 90% non-condensing

An Ethernet cable and 12V power adapter are not supplied — the unit is normally powered over PoE.

Works with