CVR
Lyman,
If Bonin was the speaker, then the words "allo? oui allo?" etcetera would have been placed in his column, labeled "Copilote place droite".
As it is, the words appear in the column labeled, among others, "Autres voix".
The mystery of the voice appearing on Track 1 (Piste1) is not so mysterious - if she picks up her phone, she is on the line, i.e. will be recorded.
Compare it to the situation where a pilot pulls his headset cables from the plug and keeps his speaker off - what is received via radio will still be on the recorder track, even though that pilot will not hear it.
Another mystery solved, I hope.