1. The system has strong compatibility and supports standard SIP 2.0 (RFC3261) and related RFC protocols.

2. Incoming call emergency light alert feature.

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

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

5. Phone case design with waterproof and dustproof features, no need for a waterproof cover, both aesthetically pleasing and practical.

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

7. Aluminum alloy die-cast shell, high mechanical strength, strong impact resistance.

8. The housing surface is high-temperature electrostatic powder coating, offering excellent antistatic properties and eye-catching colors.

9. Our company independently produces key components such as handles, hooks, and keyboards, ensuring strict quality control and rapid after-sales response.

Suited for environments with special requirements for moisture-proof, fire-resistant, noise-resistant, dust-proof, and frost-proof in places like subways, utility tunnels, tunnels, highways, power plants, gas stations, docks, and steel mills.

Usage Instructions:

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

2. The called party hears the ringtone → picks up the handle to answer the phone, and both parties have a normal conversation.

3. End the call and hang up the receiver.