void ipClient_DTMFToneRecognized(object sender, DTMFToneEventArgs e)
{
bool inAudio = e.DTMFType == DTMFType.InAudio ? true : false;
// Check to make sure this DTMF event isn't some sort of an echo.
if (IsDTMFEcho(e))
{
return;
}
AddDTMFEvent(e);
RaiseDTMFToneRecognized(new CallInputEventArgs(e.LineNumber, e.DTMFString, inAudio));
}
private void AddDTMFEvent(DTMFToneEventArgs e)
{
try
{
// Update our DTMF event data for this line
DTMFEventData newDTMFData = new DTMFEventData();
newDTMFData.DTMFString = e.DTMFString;
newDTMFData.InAudio = e.DTMFType == DTMFType.InAudio ? true : false;
newDTMFData.Time = DateTime.Now;
dtmfEvents[e.LineNumber].Add(newDTMFData);
// Only hold a maximum of the last 10 digits
if (dtmfEvents[e.LineNumber].Count > 10)
{
dtmfEvents[e.LineNumber].RemoveAt(0);
}
}
catch
{
}
}
private bool IsDTMFEcho(DTMFToneEventArgs e)
{
try
{
bool inAudio = e.DTMFType == DTMFType.InAudio ? true : false;
foreach (DTMFEventData dtmfData in dtmfEvents[e.LineNumber])
{
// Are the digits the same?
if (dtmfData.DTMFString == e.DTMFString)
{
// Is it a different type of dtmf event?
if (dtmfData.InAudio != inAudio)
{
// Is the timestamp difference within 3 seconds?
if (((TimeSpan)(DateTime.Now - dtmfData.Time)).TotalSeconds <= 3)
{
// If we get here, this is probably an echo
return(true);
}
}
else
{
// Is the timestamp differnce within 50 ms?
if (((TimeSpan)(DateTime.Now - dtmfData.Time)).TotalMilliseconds <= 50)
{
// If we get here, this is probably an echo
return(true);
}
}
}
}
}
catch
{
}
return(false);
}
private bool IsDTMFEcho(DTMFToneEventArgs e)
{
try
{
bool inAudio = e.DTMFType == DTMFType.InAudio ? true : false;
foreach (DTMFEventData dtmfData in dtmfEvents[e.LineNumber])
{
// Are the digits the same?
if (dtmfData.DTMFString == e.DTMFString)
{
// Is it a different type of dtmf event?
if (dtmfData.InAudio != inAudio)
{
// Is the timestamp difference within 3 seconds?
if (((TimeSpan)(DateTime.Now - dtmfData.Time)).TotalSeconds <= 3)
{
// If we get here, this is probably an echo
return true;
}
}
else
{
// Is the timestamp differnce within 50 ms?
if (((TimeSpan)(DateTime.Now - dtmfData.Time)).TotalMilliseconds <= 50)
{
// If we get here, this is probably an echo
return true;
}
}
}
}
}
catch
{
}
return false;
}
void ipClient_DTMFToneRecognized(object sender, DTMFToneEventArgs e)
{
bool inAudio = e.DTMFType == DTMFType.InAudio ? true : false;
// Check to make sure this DTMF event isn't some sort of an echo.
if (IsDTMFEcho(e))
return;
AddDTMFEvent(e);
RaiseDTMFToneRecognized(new CallInputEventArgs(e.LineNumber, e.DTMFString, inAudio));
}
private void AddDTMFEvent(DTMFToneEventArgs e)
{
try
{
// Update our DTMF event data for this line
DTMFEventData newDTMFData = new DTMFEventData();
newDTMFData.DTMFString = e.DTMFString;
newDTMFData.InAudio = e.DTMFType == DTMFType.InAudio ? true : false;
newDTMFData.Time = DateTime.Now;
dtmfEvents[e.LineNumber].Add(newDTMFData);
// Only hold a maximum of the last 10 digits
if (dtmfEvents[e.LineNumber].Count > 10)
dtmfEvents[e.LineNumber].RemoveAt(0);
}
catch
{
}
}