Cisco IP Telephony: Planning, Design, Implementation, Operation, and Optimization [Electronic resources] نسخه متنی

Chapter 6. Design of Call-Processing Infrastructure and Applications

High-level IPT design

Low-level design

Securing the IPT infrastructure

This chapter uses information collected in the design questionnaires listed in Appendixes D, "IPT Design Phase: IP Phone Selection Questionnaire," through F, "Ordering T1/E1 PRI from the Carrier Questionnaire". It also uses the information collected about XYZ in Chapter 3, "Large-Scale Enterprise Requirements for IP Telephony." To review the high-level architecture of the proposed IPT solution for XYZ, which is a multisite WAN with distributed call processing, see Figure 5-1 in Chapter 5, "Design Phase: Network Infrastructure Design."