Voice Over IP

CONFIGURATION AND TOPOLOGY CHOICES

Let us return to the subject of the supporting technologies for VoIP. We stated earlier that the issue of IP telephony is not if, but how. Figure 1-8 shows some of the technology choices to answer the how question.

Figure 1-8. Technology choices to support VoIP

It is very unlikely that IP telephony will operate over a single bearer service. Moreover, as the Internet task forces continue to refine multiservice Request for Comments (RFCs), it is also unlikely that only one teleservices protocol stack will be used.^[9] A more likely scenario is the existence of a multiplicity of support options. Here are some ...