[Freeswitch-users] SIP.js / mobile devices / speakers

Hi, this is maybe not the best maillinglist for my problem but I did not find a better one :) I am playing around with SIP.js and freeswitch as backend. Works fine so far. But is it possible to use the inernal speaker of a mobile device when using SIP.js? If I use it with my android phone, always the external (loud) speaker is active but I just want to use it like a normal voice call (holding my device near my ears). Is there any option to switch speakers perhaps? Thanks in advance, Thorsten