"In this paper we have described about the functional requirements and design of an IP Telephone and we have formulated a QoS based routing algorithm with a single administrative domain which can be extended to multiple domains. The long-time promise of being able to replace or enhance the traditional PBX by combining voice and data services onto a single network can now finally be realized. In order to do so, a very low-cost telephony device capable of directly exchanging IP packets with the data network is required. Development of this 'IP Telephone' will require the development of a 'system on a chip' which combines digital signal processing (DSP) functions, micro controller (MCU) functions, analog interface, telephone user interface, network interface and associated glue logic."
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