Since the IP telephony Cookbook is a technical reference document it must include guidelines for users who do not want to read the whole document in order to find the information they need. In this section we give the reader tips on how to read the document in order to retrieve the information needed as fast as possible; for a detailed overview of the contents of the Cookbook please refere to the previous section. To speed uo the information retrieval process each readers of this document should identify himself in one of the three main groups:

The users belonging to the first group should, first of all, refer to Chapter 2 to acquire the necessary background to understand the rest of the Cookbook, moreover those kind of users who want to set up an IP telephony service should read the Chapter 3 to have a clear picture of the possibile scenarios offered by the IP telephony and which is best suited to their environment needs. The second group of users should skip the previous mentioned chapters even if Chapter 3 may be of some interest to them; the main focus of this group of users is more likely to be in the Chapter 4 and Chapter 5 in order to have tips and help in setting up an operative service. The third group of users is likely to be more interested in the "value added" services available nowadays with IP telephony (Chapter 6) or in the integration problem of a IP telephony architecture widely distributed across multiple site and organizations (Chapter 7). Moreover, all three groups of users may find useful regulatory information inserted in Chapter 8 and european project information in Annex A. Last but not least, the product list testing experience reported in Annex A is a must for all users who do not want to risk to make wrong choices in buying decision.