VoIP follows a layered model comparable to the OSI seven
layered model we are familiar with. Just
like the purpose of developing the OSI model, breaking into defined layers
provides a framework. It establishes a standard to make the system more
manageable and flexible. Each layer is relatively independent to other layers
around it. Changes made to one layer should have no, or minimal impact on other
layers.
Configuration
- There are several VoIP configuration options available. The first option is telephone connection with the VoIP gateways. The VoIP gateways, which provide encoding, compression and encapsulation functions, translate the voice signals to data signals, and vice versa. The second option is PC connection with routers. The router is used to verify the destination IP address in the packet and transmit the traffic subsequently. The encoding, compression, and encapsulation processes are all completed at the PCs, not routers. The third option is telephone-to-PC connection. With this operation, the routers are added extended capabilities and functions from a VoIP gateway.
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