求教高手，利用c#编写TAPI3的拨打电话程序的事件响应问题，外呼怎么触发不了事件。

[somymusic2]

我编写了一个利用TAPI3.0拨打电话的程序，电话可以正常拨通，但是我想获取拨打电话过程中的线路状态（即是否已经拨通），看了不少资料例子都说TAPI有事件响应的，但是我点完呼叫按钮（BUTTON）以后，似乎事件响应函数并没有反应，我想知道在利用CreateCall函数开始拨号以后到底应该产生什么事件（是TE_CALLSTATE吗？），我的textBox1控件中什么内容也没有，应该说明Event函数应该没有被调用，求高手帮助，谢谢。

TAPI注册事件代码：
tc.ITTAPIEventNotification_Event_Event += new ITTAPIEventNotification_EventEventHandler(this.Event); //注册TAPI通知事件
tc.EventFilter = (int)(TAPI_EVENT.TE_CALLNOTIFICATION |
TAPI_EVENT.TE_DIGITEVENT |
TAPI_EVENT.TE_PHONEEVENT |
TAPI_EVENT.TE_CALLSTATE |
TAPI_EVENT.TE_GENERATEEVENT |
TAPI_EVENT.TE_GATHERDIGITS |
TAPI_EVENT.TE_REQUEST); //初始化事件过滤器

事件响应部分：
public void Event(TAPI3Lib.TAPI_EVENT te, object eobj)
{
string str = "";
textBox1.AppendText("函数走到这里了");
switch (te)
{
case TAPI3Lib.TAPI_EVENT.TE_DIGITEVENT:
TAPI3Lib.ITDigitDetectionEvent dd = (TAPI3Lib.ITDigitDetectionEvent)eobj;
str = "Dialed digit" + dd.ToString();
textBox1.AppendText(str);
break;
case TAPI3Lib.TAPI_EVENT.TE_GENERATEEVENT:
TAPI3Lib.ITDigitGenerationEvent dg = (TAPI3Lib.ITDigitGenerationEvent)eobj;
str = "Dialed digit" + dg.ToString();
textBox1.AppendText(str);
break;
case TAPI3Lib.TAPI_EVENT.TE_PHONEEVENT:
str = "A phone event!";
textBox1.AppendText(str);
break;
case TAPI3Lib.TAPI_EVENT.TE_GATHERDIGITS:
str = "Gather digit event!";
textBox1.AppendText(str);
break;
case TAPI3Lib.TAPI_EVENT.TE_CALLSTATE:
TAPI3Lib.ITCallStateEvent a = (TAPI3Lib.ITCallStateEvent)eobj;
TAPI3Lib.ITCallInfo b = a.Call;
switch (b.CallState)
{
case TAPI3Lib.CALL_STATE.CS_INPROGRESS:
str = "dialing";
textBox1.AppendText(str);;
break;
case TAPI3Lib.CALL_STATE.CS_CONNECTED:
str = "Connected";
textBox1.AppendText(str);
break;
case TAPI3Lib.CALL_STATE.CS_DISCONNECTED:
str = "Disconnected";
textBox1.AppendText(str);
break;
case TAPI3Lib.CALL_STATE.CS_OFFERING:
str = "A party wants to communicate with you!";
textBox1.AppendText(str);
break;
case TAPI3Lib.CALL_STATE.CS_IDLE:
str = "Call is created!";
textBox1.AppendText(str);
break;
}
break;
}

拨号部分代码：
private void Dial_Click(object sender, EventArgs e)
{
String number = "13401184611";
bcc = address[currentline].CreateCall(number, TapiConstants.LINEADDRESSTYPE_PHONENUMBER, TapiConstants.TAPIMEDIATYPE_DATAMODEM);
ITCallInfo callInfo = (ITCallInfo)bcc;
bcc.Connect(false);
}

[crackdung]

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[Mr_Edwin]

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[gsbear]

public void Event(TAPI3Lib.TAPI_EVENT te,object eobj)
{
switch(te)
{
case TAPI3Lib.TAPI_EVENT.TE_CALLNOTIFICATION:
addtolist("call notification event has occured");
break;
case TAPI3Lib.TAPI_EVENT.TE_DIGITEVENT:
TAPI3Lib.ITDigitDetectionEvent dd=(TAPI3Lib.ITDigitDetectionEvent)eobj;
addtolist("Dialed digit"+dd.ToString());
break;
case TAPI3Lib.TAPI_EVENT.TE_GENERATEEVENT:
TAPI3Lib.ITDigitGenerationEvent dg=(TAPI3Lib.ITDigitGenerationEvent)eobj;
MessageBox.Show("digit dialed!");
addtolist("Dialed digit"+dg.ToString());
break;
case TAPI3Lib.TAPI_EVENT.TE_PHONEEVENT:
addtolist("A phone event!");
break;
case TAPI3Lib.TAPI_EVENT.TE_GATHERDIGITS:
addtolist("Gather digit event!");
break;
case TAPI3Lib.TAPI_EVENT.TE_CALLSTATE:
TAPI3Lib.ITCallStateEvent a=(TAPI3Lib.ITCallStateEvent)eobj;
TAPI3Lib.ITCallInfo b=a.Call;
switch(b.CallState)
{
case TAPI3Lib.CALL_STATE.CS_INPROGRESS:
addtolist("dialing");
break;
case TAPI3Lib.CALL_STATE.CS_CONNECTED:
addtolist("Connected");
break;
case TAPI3Lib.CALL_STATE.CS_DISCONNECTED:
addtolist("Disconnected");
break;
case TAPI3Lib.CALL_STATE.CS_OFFERING:
addtolist("A party wants to communicate with you!");
break;
case TAPI3Lib.CALL_STATE.CS_IDLE:
addtolist("Call is created!");
break;
}
break;
}
}