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<TITLE>Generating Inband Digits and Tones</TITLE>
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<H3><A NAME="_tapi2_generating_inband_digits_and_tones"></A>Generating Inband Digits and Tones</H3>

<P>After a call is in the <I>connected</I> state, information can be transmitted over it. Two functions are provided that allow end-to-end inband signaling between the application and remote station equipment such as an answering machine. One function is <A HREF="func1_8ir7.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_8ir7.htm"><B>lineGenerateDigits</B></A>, which generates inband digits on a call, signaling them over the voice channel. Digits can be signaled as either rotary/pulse sequences or as DTMF tones. The other function is <A HREF="func1_23xh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_23xh.htm"><B>lineGenerateTone</B></A>, which enables the application to generate one of a variety of multifrequency tones inband (over the media stream). This generates telephony tones, such as ringback, beep, and busy, as well as arbitrary multifrequency, multicadenced tones. </P>

<P>Only one digit or tone generation can be in progress on a call at any one time. When digit or tone generation completes, a <A HREF="msgs_0hnp.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_0hnp.htm">LINE_GENERATE</A> message is sent to the application that requested the generation. In the case where multiple digits are generated, only a single message is sent back after all digits have been generated. Calling <B>lineGenerateDigits</B> or <B>lineGenerateTone</B> while digit or tone generation is in progress will abort the generation currently in progress and send the LINE_GENERATE message to the application whose generation was aborted with a <I>cancel</I> indication. </P>

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