I solved the problem. While Siri is talking turn up the volume by side button. Siri and telephone volume rise up. Willy

Hi, I have a bluethooth headphone set working correctly on my iphone 4S. While I'm listening music by ipod it works correctly (high volume), but if I'm listening SIRI feedback or telephone voice (also with max bluethooth/telephone volume setting), the volume is low. could you help me? Thanks...