Recording to wav format creates noisy files

[NLLAPPS]

I have run linphone-android with wav format recording to test and noticed that while mkv recording of calls are good, wav format creates distorted audio. See attached sample.

https://gitlab.linphone.org/BC/public/liblinphone/-/blob/e74818b7768b968671d0b0464d9e251a60cd68fd/linphone/mediastreamer2/src/msfilerec.c suggest that sampling rate should be 8000 but created wav file has 48000 Test.zip