add bind meta on A-D and refactor

src/include/switch_channel.h

@@ -256,6 +256,8 @@ SWITCH_DECLARE(switch_status_t) switch_channel_set_variable_partner_var_check(sw
 																			  const char *varname, const char *value, switch_bool_t var_check);
 SWITCH_DECLARE(const char *) switch_channel_get_variable_partner(switch_channel_t *channel, const char *varname);
 
+SWITCH_DECLARE(const char *) switch_channel_get_hold_music(switch_channel_t *channel);
+SWITCH_DECLARE(const char *) switch_channel_get_hold_music_partner(switch_channel_t *channel);
 
 #define switch_channel_set_variable(_channel, _var, _val) switch_channel_set_variable_var_check(_channel, _var, _val, SWITCH_TRUE)
 #define switch_channel_set_variable_partner(_channel, _var, _val) switch_channel_set_variable_partner_var_check(_channel, _var, _val, SWITCH_TRUE)

src/include/switch_types.h

@@ -156,6 +156,7 @@ SWITCH_BEGIN_EXTERN_C
 #define SWITCH_PROXY_MEDIA_VARIABLE "proxy_media"
 #define SWITCH_ENDPOINT_DISPOSITION_VARIABLE "endpoint_disposition"
 #define SWITCH_HOLD_MUSIC_VARIABLE "hold_music"
+#define SWITCH_TEMP_HOLD_MUSIC_VARIABLE "temp_hold_music"
 #define SWITCH_EXPORT_VARS_VARIABLE "export_vars"
 #define SWITCH_BRIDGE_EXPORT_VARS_VARIABLE "bridge_export_vars"
 #define SWITCH_R_SDP_VARIABLE "switch_r_sdp"

src/include/switch_utils.h

@@ -184,6 +184,32 @@ static inline switch_bool_t switch_is_digit_string(const char *s)
 	return SWITCH_TRUE;
 }
 
+static inline char switch_itodtmf(char i)
+{
+	char r = i;
+
+	if (i > 9 && i < 14) {
+		r = i + 55;
+	}
+
+	return r;
+}
+
+static inline int switch_dtmftoi(char *s)
+{
+	int r;
+
+	switch_assert(s);
+
+	if (!(r = atoi(s))) {
+		int l = tolower(*s);
+		if (l > 96 && l < 101) {
+			r = l - 87;
+		}
+	}
+
+	return r;
+}
 
 static inline uint32_t switch_known_bitrate(switch_payload_t payload)
 {