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The supplementary service is a service that modifies or supplements the basic telecommunication service. It cannot be provided to users separately from the basic calling service, and must be provided together with the corresponding basic telecommunication service.

The supplementary service is a service that modifies or supplements the basic telecommunication service. It cannot be provided to users separately from the basic calling service, and must be provided together with the corresponding basic telecommunication service.

Chinese name

Supplementary business

English name

supplementary service

definition

Services that modify or supplement basic telecommunication services. Supplementary services must be provided with the corresponding basic telecommunication services.

Applied discipline

Communication technology (first-level discipline), service and application (second-level discipline)

The above content was published by the National Science and Technology Terminology Examination Committee.

Chinese name

Supplementary business

Foreign name

Supplementary Service

Complementary business background

The establishment and development of mobile communication networks stems from the original intention of people to initially and conveniently communicate with other people. Although various technologies have continued to innovate, the network architecture has continued to evolve, the Internet speed has continued to increase, and mobile calls As the first network function that came into people's lives, it is still widely used until now.

Let's first briefly describe the general process of a basic mobile call:

Whether it is a fixed user or a mobile user, when we need to make a call, we first need to enter the phone number of the other party. Of course, there is also an off-hook action for fixed users. The initiator of a call service, we call it the main Calling user, and the destination of the call is called called user. A basic call is the entire process that the calling party initiates a call request, and the network connects the called user according to its dialing requirements.

Supplementary business definition

In addition to basic calling functions, the mobile communication network also provides a series of SS (Supplementary Service).

The supplementary service is a service that modifies or supplements the basic telecommunication service. It is a service function that is specially provided to the user and meets the special application scenario depending on the basic call. It cannot be provided to the user separately from the basic call service. ^[1]

Supplementary business typical business

Below we list the typical supplementary services mentioned in the 3GPP protocol, as shown in Figure 1. ^[1]

Figure 1 Typical supplementary services ^[1]

• Number display service: Simply connecting the call between the calling and called users can no longer meet people's needs. When we, as the called party, want to know who the call is, and then decide whether to answer the call, the calling number The display will help you report this information.

• Call forwarding service: When certain conditions occur, it may be inconvenient to answer the call, then try the call forwarding service and forward it to another number.

• Call waiting and call hold services: What should we do when we have a new incoming call while we are talking? What if I missed a call from an important person? Sign-up call waiting is a warm reminder for your new incoming call, and call hold ensures you can switch between two calls at will.

• Multi-party call service: Is the call between two people unable to meet the requirements? Need to add more people to a call? Do nt worry, the multi-party call service will definitely help you get it.

• Call barring service: Why are all outgoing calls rejected by the network? It turned out to be the fault of the mobile phone's arrears; what do I do if I do nt want to be disturbed by too many calls when roaming abroad? Rest assured, the incoming call restrictions for roaming out of the PLMN allow you to avoid interruptions and enjoy the comfort and comfort of the holiday.

• Call forwarding service: This is a very interesting supplementary service. It is like a matchmaker for both parties. What is the call process like?