1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Management summary
6.1 Scope of functionality
7 Technical concept
7.1 Voice over internet protocol (IP)
7.2 Call set-up delay and session initiation call set-up delay
7.3 Call set-up time (post dialling delay)
7.4 Premature release probability (call failure rate (CFR))
7.5 Telephony cut-off call ratio [%] (call drop rate)
7.6 Unsuccessful call ratio [ETSI ETR 138]
7.7 Media establishment delay
7.8 Level of active speech signal in receive direction
7.9 Noise level in receive direction
7.10 Signal-to-noise ratio in receive direction
7.11 Speech signal attenuation (or gain)
7.12 Talker echo delay
7.13 Double talk performance
7.14 Interrupted voice transmission
7.15 Listening speech quality
7.16 Listening speech quality stability
7.17 End-to-end audio delay
7.18 End-to-end audio delay variation
7.19 Frequency response in receive direction
7.20 Fax transmission in accordance with [ITU-T T.30] and [ITU-T
T.38]
7.21 Early media listening speech quality
7.22 Jitter buffer and IP prioritization response time