switch_dtmf_t 579 mod_freetdm/mod_freetdm.c static switch_status_t channel_send_dtmf(switch_core_session_t *session, const switch_dtmf_t *dtmf) switch_dtmf_t 694 mod_freetdm/mod_freetdm.c switch_dtmf_t _dtmf = { 0, SWITCH_DEFAULT_DTMF_DURATION };