I had observed this in the network I worked on previously. There are two kinds – one is this clicks and the other is a metallic kind of noise.
Check if the clicks happening during HO, exp at the edges of the cell and also monitor the TCH usage during that time.
Thanks guys, I thought nobody will answer that. After many measurements and voice recording we found that it is happening only with cells with AMR activated during codec changes in AMR_HR. Some Alcatel experts changed software in TC boards from B9 to B10 , but still the same, we hear clicks, exactly those described from Amit (metallic noise like fighting with swords).It’s happening randomly especially in WCS cells (NGN), those in Legacy not. Ok Pix, we’ll try to disable DTX again and see for results after measurements even if we changed almost everything, it’s not bad to try again, just imagine what costumers think about that when hear those clicks.
Thanks again guys!