It's possible to get outgoing call duration during call?

Question

Hi, i would get outgoing call duration a call, I thought to get when the persone to the other side answer my call, but with PhoneStateListener we can get the state of a call, but PhoneStateListener changes state to CALL_STATE_OFFHOOK immediately when the outgoing call starts and not when the person to other side answers, so i can't get the effective time of call during a conversation. Any ideas to do this

Thanks in advance!