Understanding Gateways

Jul 17,2008 by admin

Understanding Gateways

A gateway is a device that translates one type of signal to a different type of signal. There are different types of gateways, including the voice gateway, as illustrated in Figure 5-6.

Figure 5-6. Gateway Interfaces

A voice gateway is a router or switch that converts IP voice packets to analog or digital signals that are understood by TDM trunks or stations. Gateways are used in several situations (for example, to connect the PSTN, a PBX, or a key system to a VoIP network).

In Figure 5-6, the voice-enabled router (that is, the voice gateway) examines the incoming IP packet to determine whether it is a voice packet and determine the packet's destination. Based on information inside the voice packet, the router translates the digitized signal or voice into the appropriate analog or digital signal to be sent to the PSTN. For a call coming from the PSTN, the gateway interprets the dialed digits and determines the IP destination for the call.

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