What is the function of program-controlled switch?

PBX telephone switchboard has four basic calling functions. According to the calling direction and calling source in and out of the switchboard, calls can be divided into local calls, outgoing calls, incoming calls and transfer calls. A switch is understood as a switching office, and the calls initiated by users in this office can be divided into outgoing calls or local calls according to the flow direction of the calls. The calling user generates an outgoing call, and when the called user is another user of the local office, the calling user calls the local office; When the called user is not a user in this office and the switch needs to connect the call to other switches, an outgoing call is formed. Correspondingly, when incoming calls from other exchanges call the users of this office, incoming calls are generated; The caller is not a user of this office, and the switch is connected to other switches, which only provide the function of tandem transfer, forming a transfer call. ...

Established in 2005, Beijing Hua Xun Ye Jia Technology Development Co., Ltd. is a company specializing in communication electronics, program-controlled switches, group telephones, online recording, network engineering, integrated wiring, system integration, sales, installation, debugging and maintenance of various famous imported and domestic communication products. And provide customers with technical consultation, engineering design and budget, so that customers can enjoy the best service and the best communication solution at the lowest cost. Hua Xun Ye Jia will provide efficient pre-sale, mid-sale and after-sale services for new and old customers with higher standards and stricter requirements, and move towards a better tomorrow. Our company is the calling iP long-distance agent of China Netcom, China Telecom and China Tietong, providing customers with calling iP long-distance services of China Netcom and China Tietong free of charge, and providing on-site services.

Company name: Beijing Hua Xun Ye Jia Technology Development Co., Ltd.

Engineering Department: Room 502, Unit 3, Building 20, Shuangyushu Dongli, Haidian District, Beijing.

Sales Department: Room 2603, Building 6, Tiancheng, Shui Mu, Haidian District, Beijing.

Success stories:

People's Daily

Xiaoying thermal power plant

Beijing linglan advertisement

Qi Ming kindergarten

Shanghai literature and art publishing house

Shui Mu Lanting property

Shanghai He Ju advertising company

Beijing Nanyang Education Investment Co., Ltd.

Shanghai wangshi advertisement

Sanguang medical equipment (Beijing) Co., Ltd.

Jiudingxuan real estate project co., ltd

Elliot Ngok & Co.

Hong Kong Meiya Real Estate Beijing Representative Office

No.3 waterworks

Lu Xin ying da real estate company

China academy of sciences institute of digital and mathematical systems

Urban construction decoration company

six space

Beijing hongji

Zhanlan road sub-district office

Beijing poly international auction co., ltd.

Zhong Jinhui private club

Zhongguancun Science and Trade Building, Wu Liuqi Commodity City

Beijing yichu electronics co., ltd

Youshoukun Xi Consultation (Beijing) Co., Ltd.

Beijing Zhongjiao Construction Engineering Bidding Co., Ltd.

Zhongdi seed industry co., ltd

Beijing dachuan machinery electronic equipment co., ltd

Jianyan technology co., ltd

Huairou Jingxin automobile maintenance factory

China electronic engineering co., ltd

Beijing ruisite property

Swiss Chamber of Commerce in China