I'm looking for a small app or a registry hack that avoid the smartphone to switch off the speaker when a conversation is engaged.
I'm using an HTC touch 3G (Jade) with a bluetooth headset JABRA BT8040 (configured to get the free-hand and NOT the A2DP).
So, In a normal situation, the GPS instructions are sent to the speaker and the conversation to the Jabra headset. But when I answer a call the speaker switches off automatically and I can't hear the GPS instructions anymore untill the end of the call. Does anyone knows how to activate both sounds together?
By looking on the xda-developpers forum, I've seen that using some HTC splitter had this effect but it is not clear why.
Thanks for your help