�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����