Samuel Vinson wrote: > Hi, > > Several persons complain about the volume of recorder. I will look for > hardware solution. > But if I will not find, do you know if there is software solution ? If > yes, does it exist in PjSIP ? The easiest is to use pjsua_conf_adjust_tx/rx_level(). For example, to amplify the mic signal twice, we use: pjsua_conf_adjust_rx_level(0, 2.0); -benny