According to sipX\sipXphone\src\pingerjni and
sipXtapi\sipXmediaLib\src\mp\MpdPtAVT.cpp:257, you should do the following:
unsigned short iButton = (unsigned short) pCallInfo->toneId;
unsigned short isButtonUp = (iButton & 0x8000);
if ( isButtonUp )
{
iButton = iButton & 0x0003FFF;
}
The real problem lies in the fact that you may not always get this event,
depending on VoIP service provider as well as PSTN gateway. Correct me if
some one there knows more on why this event does not occur consistently.
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