4.6.3. Generating DTMF

Once DTMF support has been configured (see Section 4.6.1, Specifying DTMF Support), the application can use the gc_Extension( ) function to generate DTMF digits. The relevant gc_Extension( ) function parameter values in this context are:

• target_type should be GCTGT_GCLIB_CRN
• target_id should be the actual CRN
• ext_ID should be IPEXTID_SEND_DTMF

The GC_PARM_BLK pointed to by the parmblkp parameter must contain the following parameter set ID and one of the following parameter IDs:

• IPSET_DTMF - The parameter set specific to DTMF.
  • IPPARM_DTMF_ALPHANUMERIC - For H.323, specifies that DTMF digits are to be sent in H.245 User Input Indication (UII) Alphanumeric messages. For SIP, this parameter is not supported.
  • IPPARM_DTMF_RFC_2833 - Specifies that DTMF digits are to be sent in the RTP stream as defined in RFC 2833. The DTMF information is contained in the parameter value which is of type IP_RFC2833_EVENT.

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