Types of WAN for voice over IP technologies

1. Are long distance prices increasingly competitive.Low recording IP WAN technologies and enabled VoIP (voice over Internet Protocol) international calls are more and more users attracts.

VoIP phone systems to be a competitive alternative to a conventional PSTN (public switched telephone network) seen. VoIP phones are to the receive and make calls used on intellectual property. The omnipresence of intellectual property, technology, the networking of organisations offers the potential for a wide range of voice and data services, have great - provide benefits as low-cost PSTN services. VoIP WAN technologies include: Call Agent SIP server. Signaling Gateway. Bandwidth Manager. and the gateway to the Subscriber.

Call agent

Agent call exists in the service provider network and provides the logic of the call and the call of the functionality, responsible for all calls in the network.

Call Agent also participates in the signalling and control flow, introduction ends and transmit messages. There are multiple protocols including SIP (Session Initiation Protocol), SIP - T and ISDN (integrated services digital network). A SIP Server provides similar functionality in a SIP signaling traffic network as such as routing and execution policy of SIP applications and storage call documented detailed transmission.

Signaling Gateway.

Signaling Gateway is located in the ISP network and works as a bridge between the agent call signaling and SS7 (signalling system # 7) - based PSTN.

It can also be UtIlisée as a signaling gateway between the different areas of the carrier package. It is used an interpretation between SIP and offer SS7 signaling.

(B)

andbreite Manager

Bandwidth Manager is located in the service provider network and provides the requested QoS (quality of service) in the network.

It is for Construirefaire down your network bandwidth used and managing access to this bandwidth for calls. It is also responsible for the implementation of policies on border routers to control the flow of media on a per call basis.

The Subscriber Portal

Subscriber gateway on client sites available and completed the WAN client places.

There are two main data connections and voice ports. Typically, a Protocol control unit including h. 248 (the Media Gateway Control Protocol) is used. Its functions are similar to the access gateway, but it supported ports less than voice.