1
Scope
2 Introduction
3 References
4 Abbreviations
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 phonecommunication
6.4 Configuration C: IP phone-to-IP phonecommunication
7 Network capabilities to support IP
telephony
7.1 Service aspects
7.2 Charging
considerations
7.3 Quality of Service
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 Recommendations in support of IP telephony