CONTENTS

 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