There appears to be a disagreement between the encoding given in the
sources for Siren14 that are downloaded from Polycom (and the ITU, both
are the same) and that implemented by codec_siren14.so. The latter
agrees with the actual device.
If I make a .sln32 file and run the encoder from ITU/Polycom with
encode 0 foo.sln32 foo.siren14 48000 14000
the resulting file doesn't play back correctly with the Digium's siren14
codec. I know the parameters are correct because the file is the same
size as that made by the Digium codec.
Both sets of decoders/encoders (Digium and Polycom/ITU) are symmetric and
can decode what they encode, but neither can read the encoding of the other.
Is there some subtle difference between G.722.1C and Siren14?
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