Our developer uses a mjsip when he is making a call. Is mjsip compatible with asterrisk? When they tried to call a number, and the called party answer the phone, they cannot hear the voice on the calling party. And while ringing a phone when they press the hangup button on the mjsip the mjsip diesplay the hangup on the small screen, but on the other end it is still riging. And base on the logs, it still ringing. How can we resolve this problem. Need your help.