Generating Inband Digits and Tones - Telephony API Programmer's Reference

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Generating Inband Digits and Tones

Once a call is in the connected 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 lineGenerateDigits, 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 lineGenerateTone, 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 multi-frequency, multi-cadenced tones.

Only one digit or tone generation can be in progress on a call at any one time. When digit or tone generation completes, a LINE_GENERATE 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 lineGenerateDigits or lineGenerateTone 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 cancel indication.

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