Between the device and the middleware there will be network of networks. Gateways are deployed when there are different transport bearers or networks with dissimilar proto-cols. For example, we need an IVA gateway to interface voice with a computer, or an WAP gateway to access internet over a mobile phone. The following diagram (Figure 1.2) depicts a schematic diagram of services in a mobile computing environment where services from enterprise to a vending machine can be used from different devices.
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