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Content for  TS 23.333  Word version:  17.1.0

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6.2.5  DTMF Collection Procedurep. 77

On receipt of a request to detect DTMF Digits, the MRFC may command the MRFP to report DTMF Digits as defined in the Detect DTMF Procedure.
MRFC shall assign the RTP Payload Type for DTMF Telephony Events. When a DTMF Digit has been detected by the MRFP it shall report it to the MRFC.
When requested to detect DTMF the MRFP shall not forward the reported digit toward another connection.
An example sequence is shown in Figure 6.2.5.1.
Copy of original 3GPP image for 3GPP TS 23.333, Fig. 6.2.5.1: DTMF Telephony Event Detection
Figure 6.2.5.1: DTMF Telephony Event Detection
(⇒ copy of original 3GPP image)
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DTMF digit detection may be stopped by the MRFC sending the procedure Stop DTMF Detection. The MFRP, once it has acknowledged this request will no longer check for DTMF digits or report them to the MRFC.

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