Audio codec settings dont save

Cant get the audio codec settings to save. Each time I open the app I need to go into the settings and enable the codec I need to use for my special application. All other settings stay where I set them except the audio codec.

Using the app on iPad Air, iOS 8.1.3 and 8.2 with the same results.

Please fix this and my review will be higher.

G552 about Linphone, v2.2.5