Emergency Help Hotline for Subway Construction Dedicated Intercom Equipment

I. Functional Overview
1. Wall-mounted installation, aluminum alloy die-cast housing with a wall thickness of not less than 5mm, offering strong anti-vandalism performance.
2. Industrial triple-proof design, waterproof and dustproof rating meets GB/T 4208-2017 IP68.
3. Supports SIP 2.0 protocol, RJ45 interface, and allows registration of no fewer than three SIP accounts.
4. Supports full-keypad dialing or automatic dialing, with three customizable function keys.
5. Built-in 30W power amplifier circuit, capable of connecting external horn speakers and incoming call reminder signal lights.
6. Supports external 30W speaker amplification and incoming call alert warning lights.
7. Supports Power over Ethernet (PoE) or AC/DC power supply.
8. Supports audible and visual incoming call alerts, automatically enabling broadcast intercom and detecting busy tones to disconnect.
9. Features a built-in 2W speaker, enabling automatic broadcast announcements even without an external speaker.
10. Supports both handset and hands-free calling modes.
11. Supports querying and modifying the local IP address.
12. Equipped with fluorescent and backlit keypads to meet dialing needs in low-light conditions.

II. Operation and Usage
1. On/Off-Hook Method: Controlled via the handset; lifting the handset connects the call, while hanging up disconnects.
2. Answering Calls: When an incoming call is received, the phone rings. Lift the handset to communicate and hang up after the call ends.
3. Making Calls: Lift the handset and dial using standard telephone procedures to communicate with the other party.
4. Broadcast Amplification: After detecting a preset number of rings, the system automatically activates broadcast ringing, light alerts, and broadcast announcements.

III. Main Technical Parameters
1. Supports connection to Ethernet switches and SIP broadcast dispatch servers.
2. Temperature: -40°C to 75°C; Relative Humidity: 10% to 95%; Atmospheric Pressure: 86–106 kPa; Ambient Noise: ≤100 dB(A) 
3. Ringing Sound Level: ≥120 dB 
4. Supports busy tone detection for disconnection.

IV. Packaging Dimensions
Unit Dimensions: 356*277.5*130mm
Outer Box Dimensions: 420*490*330mm
Packaging Materials: EPE foam, carton
Gross Weight: 9kg
Net Weight: 8kg

V. Support and Service
Free 14-month warranty under normal use, excluding human damage and natural disasters.
All accessories are produced and stocked long-term. Post-warranty, we continue to provide product after-sales support.