There is an opus patch for asterisk 11.
https://github.com/seanbright/asterisk-opus/tree/asterisk-11 . But it
doesn't have Packet Loss Resilience or Forward Error Correction, both of
which are important for voip.
2.1.6. Packet Loss Resilience
Audio codecs often exploit inter-frame correlations to reduce the
bitrate at a cost in error propagation: after losing one packet, several
packets need to be received before the decoder is able to accurately
reconstruct the speech signal. The extent to which Opus exploits
inter-frame dependencies can be adjusted on the fly to choose a
trade-off between bitrate and amount of error propagation.
2.1.7. Forward Error Correction (FEC)
Another mechanism providing robustness against packet loss is the
in-band Forward Error Correction (FEC). Packets that are determined to
contain perceptually important speech information, such as onsets or
transients, are encoded again at a lower bitrate and this re-encoded
information is added to a subsequent packet.
There is an opus patch for asterisk 13 that includes PLR and FEC.
https://github.com/traud/asterisk-opus.
We don't have approval to move to 13. So anybody have an opus patch for
11 that includes PLR and FEC ?
sean
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