add dtmf based hangup (OPENZAP-3)

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@571 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/freetdm/src/include/openzap.h

@@ -426,6 +426,7 @@ struct zap_channel {
 	zap_buffer_t *fsk_buffer;
 	uint32_t dtmf_on;
 	uint32_t dtmf_off;
+	char *dtmf_hangup_buf;
 	teletone_generation_session_t tone_session;
 	zap_time_t last_event_time;
 	zap_time_t ring_time;
@@ -489,6 +490,8 @@ struct zap_span {
 	zap_span_start_t start;
 	void *mod_data;
 	char *type;
+	char *dtmf_hangup;
+	size_t dtmf_hangup_len;
 	int suggest_chan_id;
 	zap_state_map_t *state_map;
 };