And 800 telephone, 400 unified national access number business is China Telecom, China Unicom, China Railcom and other operators to launch a formal business enterprises to obtain a 400 after the beginning of the 10 numbers, the country (except Hong Kong, Macao and Taiwan) Users call the 400 telephone companies, without dial the area code, dial the 400 number can be, and only need to pay the city calls, free long distance. 800 calls are all free telephone call landline only, which significantly limits the scope of dialed, and customer service a lot of deficiencies. 400 calls are free long distance telephone, mobile phone, landline PHS can dial 400 calls to expand the scope of application of 700 million mobile users is an upgraded version of the 800 call, the Lord called pay-sharing mode to reduce harassment, to create value for the enterprise while improving office efficiency. 400 numbers are widely used in large enterprises, it has become famous corporate logo. Has a 400 number, the company's brand image will be greatly improved. "400 business line" is designed for enterprises to build a business, application flexibility, low rates, shortened the distance between businesses and customers. As shown above. When customers call the 400 phone call. First, the signal will be transmitted to 400 call center infrastructure systems operators, and 400 telephone system will be based on the user's settings, make a corresponding voice navigation, online message, the receiving fax the appropriate action. When the user selects the call to a number, a customer will be 400 telephone system for docking and forwarded calls via PSTN line to make a call. 

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