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Capability Model
Three different types
Tokens:
encoding=PCMU
Ascertain identity || fail
Token lists:
sampling-rate=8000,16000, 44000
Determine common subset || fail
Numerical Ranges
6 <= bitrate <= 64
Determine common sub-range || fail
Distinguish optional capabilities
silence-suppression supported
Applicable to each type, failing results in removing the capability, interoperability still possible



PPT Version