add ring_wait callstate for devstate interface

src/include/switch_core.h

@@ -109,6 +109,7 @@ typedef struct switch_device_stats_s {
 	uint32_t early;
 	uint32_t early_in;
 	uint32_t early_out;
+	uint32_t ring_wait;
 } switch_device_stats_t;
 
 

src/include/switch_types.h

@@ -1140,6 +1140,7 @@ typedef enum {
 	CCS_EARLY,
 	CCS_ACTIVE,
 	CCS_HELD,
+	CCS_RING_WAIT,
 	CCS_HANGUP,
 	CCS_UNHOLD
 } switch_channel_callstate_t;