What is an IP phone? What is the use of IP phone gateway?

What is an IP phone? What is the use of IP phone gateway?

What is an IP phone? What is the use of IP phone gateway?

The IP phone is not only convenient and fast to use, with fast transmission speed, but also saves costs. The gateway in the IP phone not only supports the acquisition of information, but also realises the corresponding routing. At the same time, it updates the transmission messages of neighboring stations and exchanges information. At the same time, it can continuously monitor the status of the router. Perform reaction and status execution. The following is a detailed introduction.

First, what is an IP phone:

1. IP telephony is the exchange of information about call establishment, disconnection, and equipment operation between users and switches and between switches and switches in a communication network. The protocols and protocols that IP telephony transmission must follow are called IP telephony methods. The functional entity that completes the transfer and control of IP phones is called IP telephony equipment. The IP telephone mode and its corresponding signaling equipment constitute a signaling system.

2. IP phones are classified into channel-associated signaling and common-channel signaling according to their transmission methods. Associated signaling is the transmission of IP telephony and language on the same channel. Mainly used for analog switching equipment, and some digital switches use channel-associated signaling. Common channel signaling refers to the transfer of signaling into common channel signaling. The common channel signaling not only has a fast transmission speed, but also has the potential to provide a large number of IP telephonys, which facilitates the opening of new services, and can perform IP phone processing during a call at low cost.

3. IP phones are divided into subscriber line IP phone signaling and inter-office IP telephony signaling according to their working area. User IP telephony signaling is the signaling between the user and the exchange, which is mainly transmitted on the user line. Subscriber line signaling mainly includes IP telephony user status signaling, IP telephony called number signaling, ring flow and signal signaling. Inter-office IP telephony signaling is the signaling between switches, which is forwarded on the inter-office trunk to control the connection and removal of calls.

ip phone

Second, the three major functions of the IP phone gateway

1. It supports the neighbor acquisition mechanism, which allows one router to request another router to agree to exchange reachability information. We can say that a router has acquired an EGP peer router or an EGP neighbor. EGP peer-to-peer routers are neighbors only in the sense of exchanging routing information, regardless of whether their geographic locations are adjacent.

2. The router continuously tests whether its EGP neighbors can respond.

3. The neighboring stations of the EGP periodically transmit routing update messages to exchange network reachability information.

4. Like GGP, EGP uses a query process to let the gateway know its neighboring gateways, and constantly exchange routing and status information with its neighbors. EGP is a state-driven protocol, meaning that it relies on a state table that reflects the situation of the gateway and a set of operations that must be performed when the state table entries change.

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