Hi, everyone, The sample streamutil has a small volume on iPhone(iOS9.0), even I turn my iphone to maximum volume. And I have printed my iphones speaker volume and mic gain, they both were showing 1.0 which means its already on maximum. I found a solution in here https://trac.pjsip.org/repos/wiki/FAQ#audio-volume , but these APIs are using under conference bridge which means I have to create by pjmedia_conf_create(), also there is a sample called confsample show the usage. But I used the streamutil as my test program. So, here are my questions: 1. Is there any functions or parameters for increasing volume when created function was using pjmedia_stream_create()? 2. Could this problem cause by other factors? Thank you for your time and kindly help. <http://about.me/kenchowcn> Ken Chow about.me/kenchowcn [image: Ken Chow on about.me] <http://about.me/kenchowcn>