6.3 Notification of DTMF Detection

Notification of DTMF detection depends on the DTMF mode being used. For out-of-band mode, when an incoming DTMF digit is detected (received from the TDM bus), the application receives an unsolicited IPMEV_DIGITS_RECEIVED event. The event data is contained in IPM_DIGIT_INFO. One event is returned for each digit that is received.

For applications using Intel® NetStructure™ DM/IP Series boards and RFC 2833 mode, the application can request notification when DTMF digits are detected by using ipm_EnableEvents( ) with the EVT_RFC2833 parameter. Once the events are enabled, when an incoming DTMF digit is detected, the application receives an unsolicited IPMEV_RFC2833SIGNALRECEIVED event. The event data is contained in IPM_RFC2833_SIGNALID_INFO.

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