How to continue to hear GPS instruction during conversation


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

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