1. The system offers strong compatibility with system expansion, supporting standard SIP 2.0 (RFC3261) and related RFC protocols.

2. With a display screen that shows incoming and outgoing call numbers, call duration, and more.

3. Speaker and microphone sensitivity are adjustable; optional voice encoding methods include G.729, G.723, G.711, G.722, G.726, and more.

4. The internal circuit of the telephone uses a universal double-sided integrated circuit, featuring accurate dialing, clear conversation, and stable operation.

5. Aluminum alloy die-cast housing, high mechanical strength, and strong impact resistance.

6. The outer shell surface is high-temperature electrostatic powder coating, with excellent anti-static properties and eye-catching colors.

7. Our company manufactures the key components such as handles, hangers, and keyboards in-house, ensuring strict quality control and a rapid response to after-sales feedback.

Suited for environments such as subway systems, tunnels, corridors, highways, power plants, gas stations, docks, steel mills, etc., with specific requirements for moisture resistance, fire prevention, noise reduction, dust prevention, and frost resistance.

Instructions for Use:

1. Register to the server and dial phone calls according to the server's dialing rules.

2. The called party hears the ringtone → picks up the handset to answer the call, and both parties engage in a normal conversation.

3. Hang up the receiver after the call ends.