Thanks askari,
wat is n7 sugnaling.
can descirbe if it possible.
wat problem i m facing is that v r using noika systen. at pk hrs from the site where i mke call , it connects after sevral attemps. and wn i chked in omcr i found no alarms , no transcoder down , many non amr and amr circuits r freesignaling r ok and on that site calls r less.