Thanx for answer.
I've made all i want with "Phone Offhook".
My BT monoheadset play itself Valkiria in the moment of incoming call. And i can't sent on it any sounds (call sound, caller name). I've made it another way. When i answer on incoming call (press answer button on bt headset), only then it play caller name. At least now I (but anybody around me) know the name of the caller.