What are the characteristics of point-to-point systems and many-to-many systems?

Peer-to-peer SMS refers to the business form of sending and receiving SMS between mobile phones. Peer-to-peer SMS has the forms of intra-network SMS, inter-network SMS and international SMS. Point in point-to-point SMS is an independent user communication tool, which can be mobile phone, client software or PDA. However, no matter what point it is, the most basic purpose of point-to-point SMS is to realize the mutual communication between two or more points, which is what people usually call chatting.

The basic function of point-to-point SMS service is chat, which can be divided into point-to-point chat, industry/enterprise application (in essence, one-to-many points), self-written SMS, inter-network communication, international communication and so on.

As a brand-new and relatively independent way of interaction, SMS has become another way for people to obtain information. With the deepening of short message culture, point-to-point short message has become one of the main ways for people to chat remotely. Peer-to-peer SMS combines the characteristics of convenience, wide use, economy and retransmission of mobile phones, and has the advantages of low price and no loss of information when turned off. At present, it is short and convenient, which can be said to be an "electronic note". Short message is the only service in GSM network and CDMA network that does not need to establish an end-to-end service path. Even if the mobile station is in complete circuit communication, it can still send short messages. Short message communication is limited to one message, in other words, the transmission of one message constitutes a communication. Therefore, the service is asymmetric, and it is generally believed that the transmission of mobile initial short messages and mobile terminal short messages are two different things. This does not prevent real-time conversation. However, the system thinks that different messages are independent of each other, and the transmission of messages is always relayed by Short Message Service Center (SMSC) outside GSM. Messages have destinations or sources, but they are only related to users and SMSC, and have nothing to do with other GSM infrastructures.