Detailed explanation of softswitch network numbers

There are many areas worth learning about the softswitch network. Here we mainly introduce the detailed knowledge of the softswitch network number. For next-generation networks, names will be used mainly for E.164 numbers. Therefore, the relationship between numbers and addressing needs to be resolved.

In E.164, You need to assign a corresponding number to each endpoint connected to the network. These numbers can be directly used for addressing. In addition, with the development of networks and businesses, E.164 numbers are not only allocated to endpoints, but also to various businesses. These business numbers include access codes or business numbers assigned to users, such as the 800 number of the centralized payment service called, and the 700 number in personal communications. These numbers are numbers assigned to individuals or enterprises and cannot be directly used for addressing. For addressing, You need to translate it into corresponding physical numbers that can be used for addressing. Therefore, numbers are divided into two layers: user-level. At this level, the number is changed to the personal name, which does not change with the network, such as the UPT number and 800 number. The other layer is the network number corresponding to each endpoint. This number is used for network addressing. Of course, the vast majority of current numbers are user-oriented and network-oriented numbers. They are the same common phone numbers, both for personal names and for network addressing. However, with the development of business and personalized development of numbers, the separation between the two layers will be more obvious. Therefore, numbers in the next generation network still have user-oriented and network-oriented address numbers.

The numbering, naming, and addressing of the Next Generation Network involves a lot of content, but in terms of numbers, the next generation network directly involves the number of SoftSwitch. The number mentioned in this article only involves the number assigned to the endpoint. We try to make a preliminary analysis on the softswitch endpoint number scheme.

With the introduction of softswitch in the network, it is necessary to consider the numbering of various terminals in the softswitch network. Softswitch terminals include fixed telephone terminals, mobile phone terminals, various IP terminals and multimedia terminals. To enable communication between these terminals and their existing network terminals, an E.164 number must be assigned to these terminals. Number assigned. How to assign a number involves charges, network organization, and business opening. This is a complicated problem. This article aims to clarify the various problems involved and compare possible solutions. Although there is no clear definition of the Next Generation Network, many countries or operators have introduced Softswitch in the network as part of the evolution to the next generation network. Softswitch-based networking features:

◆ A variety of terminals, including analog terminals, fixed telephone terminals, mobile terminals, and various multimedia terminals. Numbers must be allocated to these terminals.

◆ The size of Softswitch is large, and the network structure is more flexible than that of the traditional circuit switching network. The Application of softswitch in China is mainly based on the blank area of the network. The capacity of these areas is not very large, so a Softswitch can cover multiple cities, so it can be networked across cities.

◆ Softswitch is usually carried over IP networks. The concept of IP Networking is different from that of traditional networks. For example, IP networking does not distinguish between long-distance local and international services, while traditional networks distinguish between local and international services. Therefore, it is worth studying which concept should be used to design the numbering scheme.

◆ The number of the softswitch network has an impact on the traditional telecommunication network. Currently, the soft replacement network is mainly used for voice services. Therefore, if the fee and number of networks in the softswitch organization are different from those in the traditional network, the usage of the traditional network will be significantly affected, this bypasses the business volume of traditional networks. Therefore, multiple factors must be taken into account to determine the numbers of softswitch terminals.

Numbering Scheme

E.164 numbers are allocated in three major schemes: Bureau number scheme, network number scheme, and mixed number scheme.

(1) number structure of the bureau number

The local number is "PQR (S) ABCD", and the long-distance number is 0 + long-distance area number + local number. In this solution, various terminals, whether mobile terminals, fixed terminals, or various IP terminals, are allocated the corresponding Bureau number, and the Bureau number is allocated by the local network. Different regions have different numbers and resources. Therefore, you can use numbers headed by "P" or "PQ.

(2) number application and placement by operators

◆ After the Bureau number scheme is adopted, each operator can apply for the corresponding Bureau number in the local number plan. Different regions are identified by long-distance area numbers, and different carriers are identified by different bureau numbers.

◆ If a Softswitch needs to cover multiple cities, you need to apply for a number in multiple cities.

◆ Because the number of the Internet is used, it cannot be assigned to the carrier across regions.

◆ The range of the long-distance serial number area is the same as that of the existing long-distance serial number area.

(3) features of the numbering scheme

◆ Because bureau numbers are used, no additional number resources need to be allocated. However, for a 7-digit LAN with insufficient number resources, you must upgrade the LAN number.

◆ The user's terminal cannot be distinguished from the number. At the same time, because bureau numbers are all used, the mobile phone numbers will be different from the current number.

◆ It is difficult to identify whether the user is a user of the softswitch network or a user of the traditional telephone network by using the Bureau number. Therefore, it is difficult to select routes. The local call must identify the local call number 3 ~ 4-digit {(PQR (S). For long-distance calls, 6 ~ 7-digit number {OXlX2X3PQR (S )}. In routing selection, the users of the softswitch are connected to the IP network. Therefore, when a user of the softswitch sends a call, the user can first go through the softswitch network, arrive at the receiving end, and then enter the target network. Generally, the inbound network is used.

When a Softswitch user is called, if it is a user from another network, it should be directly connected to the softswitch network in theory. However, to determine whether the user is a Softswitch user, you need to determine 6 ~ 7-digit number. If the IP address is a Softswitch IP address, it is sent to the peer softswitch network through the softswitch network. If you cannot identify so many digits, you may encounter difficulties in selecting the softswitch network, and the ASN may be attached to the PSTN network. Only when the user arrives at the receiving end of the PSTN network can it be determined that the user belongs to the softswitch user and then is connected to the softswitch network. Even multimedia users may experience Softswitch over the PSTN network, which is not suitable for the development of multimedia services.