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Corporations are looking to harness the flexibility and ubiquity of IP as a means of automating key business transactions and increasing efficiency. As part of this ‘eRevolution’ corporate businesses are looking at migrating new applications on to their existing IP infrastructures. Computer/telephony integration and unified messaging are applications that will drive forward the integration of voice and data networks for BT's corporate customers, enabling the use of a flexible, shared IP infrastructure for voice and data. While ‘voice over IP’ is widely seen as the ‘obvious way forward’ there are many issues to be resolved before this can deliver the anticipated benefits. This paper provides an insight into the building blocks required to enable the development/deployment of shared infrastructure, for quality of service (QoS) capable, unified, IP network solutions. It highlights the detailed understanding and careful design approach required (particularly in the complex area of network QoS) to engineer custom voice solutions as part of a unified IP network design based on today's technology. Emerging protocols and technology, which may turn the unified network dream into reaility, are identified.

The integrated services digital network (ISDN) offers on-demand switched end-to-end digital connectivity over the wide area, enabling the integration of both voice and data services over a common core network. This paper considers the role of ISDN in data networking, both as the core transport network and as a means of enhancing resilience in a mixed-technology data solution, complementing other data network technologies. The issues associated with data transport based on an ISDN solution are considered, and include security, bandwidth utilisation, scalability and the management of ISDN-attached devices. Optimising the use of ISDN networks for supporting the most prevalent routed and routeing protocols is also discussed.

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