✔ NEC, International Brand, Tecom, Wanguo and other telephone switchboards, Acer IP PBX, mobile extensions, wiring installation and construction.

✔ The phone is connected to the outdoor station, which can be used to contact the door lock and open the door, wiring installation, construction, inspection and repair.

✔ Installation settings for answering machine, tape recorder, toll-saving machine, etc.

✔ Switchboard voice, ring group, speed dial, pickup, transfer, message and other settings.

✔ Switchboard, telephone, switchboard, line inspection and repair and various machine repairs.

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