I have been experimenting with video calls, and find that in general video
arrives earlier than audio on the far end. Therefore I considered setting
the parameter video_jitt_comp to a value unequal to 0, in order to have
both parts of the "stream" synchronized. However, when I set this
parameter, it is automatically forced to 0 again in .linphonerc after
closing the application (V 3.3.2, Linux). (?)