I have a pair of speakers 8ohm 40W ceiling speakers connected to a amp. The amps has a 3.5mm jack input which i've got a IP telephone plugged into using a cable that looks like the picture below. I use the Power Over Ethernet powered telephone to multicast stream audio to the speakers. Works very well. However, when there is nothing playing I am getting a rather annoying buzzing sound from the speakers. If I unplug the 3.5mm jack from the amp then it becomes silent again. So something being caused by the telephone. The telephone is being powered by PoE. One way to solve it is to reduce the output volume on the amp to a level where the sound is still there but very very low that it cannot be heard. But problem with this is that my overall volume level is then compromised. Is there a way to silence the silence?