6.6. IPSET_DTMF Parameter Set

Table 18 shows the parameter IDs in the IPSET_DTMF parameter set. This parameter set is used to set DTMF-related parameters for the notification, suppression or sending of DTMF digits.

Table 18. IPSET_DTMF Parameter Set

Parameter IDs	Type	Description
IPPARM_DTMF_ALPHANUMERIC	int	Used when sending or receiving DTMF via UII alphanumeric messages. The parameter value contains an IP_DTMF_DIGITS structure that includes the digit string.
IPPARM_DTMF_RFC_2833	int	Used when sending or receiving DTMF via RFC2833 messages. The parameter value contains an IP_DTMF_RFC2833 structure that includes the digit string.
IPPARM_DTMF_RFC2833_PAYLOAD_TYPE	int	Used to specify the RFC2833 RTP payload type. The data field is an unsigned char with a valid range of 96 to 127. The default value is IP_USE_STANDARD_PAYLOADTYPE (101).
IPPARM_SUPPORT_DTMF_BITMASK	int	Used to specify a bitmask that defines which DTMF transmission methods are to be supported. Possible values are: IP_DTMF_TYPE_ALPHANUMERIC † IP_DTMF_TYPE_INBAND_RTP IP_DTMF_TYPE_RFC_2833
See Table 12, Summary of Parameter IDs and Set IDs for H.323 and SIP applicability. † Not supported when using SIP.

Note: A User Input Indication (UII) messages (H.245) can also be used to send DTMF digits in an information signal message. See Section 6.24, IPSET_USERINPUTINDICATION Parameter Set for more information.

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