Robust Watertight Industrial Telephone land line phone retro telephone VOIP IP telephone

Features
1. Vandal proof rolled steel material.
2. Heavy Duty handset with hearing Aid compatible receiver, Noise canceling microphone.
3.Vandal resistant zinc alloy keypad.
4. The sensitivity of the speaker and microphone can be adjusted.
5. Support one-button direct call dispatcher function.
6. Audio Codes:G.729、G.723、G.711、G.722、G.726,etc.
7. Support SIP 2.0（RFC3261）,RFC Protocol.
8.Wall mounted, Simple installation.
9.Self-made telephone spare part available.
10.CE, FCC, RoHS, ISO9001 compliant.