1 Scope
2 Introduction
3 References
4 Abbreviations and acronyms
5 Terms and definitions
6 Network configurations for using IP telephony
6.1 Configuration A: Phone-to-phone communication (with IP transit
network)
6.2 Configuration B-1: IP phone-to-phone communication
6.3 Configuration B-2: Phone-to-IP phone communication
6.4 Configuration C: IP phone-to-IP phone communication
7 Network capabilities to support IP telephony
7.1 Service aspects
7.2 Charging considerations
7.3 Quality of service (QoS) considerations
7.4 User identification and addressing considerations
7.5 Security considerations
8 Network capabilities to support IP telephony interworking between the
PSTN and the IP network
9 Network address translation (NAT) and firewalls
10 Control protocols for support of IP telephony
Appendix I – Supplementary services and the corresponding ITU-T Recommendations
that define them
Appendix II – Standard development related to IP telephony
Appendix III – J-series ITU-T Recommendations in support of IP telephony