ari: Provide the caller ID RDNIS for the channels

Provide the caller ID RDNIS when available. This will allow an
application to follow the redirect.

(cherry picked from commit da0b1ac1c1)

main/stasis_channels.c

@@ -1323,6 +1323,10 @@ struct ast_json *ast_channel_snapshot_to_json(
 		"creationtime", ast_json_timeval(snapshot->base->creationtime, NULL),
 		"language", snapshot->base->language);
 
+	if (!ast_strlen_zero(snapshot->caller->rdnis)) {
+		ast_json_object_set(json_chan, "caller_rdnis", ast_json_string_create(snapshot->caller->rdnis));
+	}
+
 	if (snapshot->ari_vars && !AST_LIST_EMPTY(snapshot->ari_vars)) {
 		ast_json_object_set(json_chan, "channelvars", ast_json_channel_vars(snapshot->ari_vars));
 	}

res/ari/ari_model_validators.c

@@ -1067,6 +1067,15 @@ int ast_ari_validate_channel(struct ast_json *json)
 				res = 0;
 			}
 		} else
+		if (strcmp("caller_rdnis", ast_json_object_iter_key(iter)) == 0) {
+			int prop_is_valid;
+			prop_is_valid = ast_ari_validate_string(
+				ast_json_object_iter_value(iter));
+			if (!prop_is_valid) {
+				ast_log(LOG_ERROR, "ARI Channel field caller_rdnis failed validation\n");
+				res = 0;
+			}
+		} else
 		if (strcmp("channelvars", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
 			prop_is_valid = ast_ari_validate_object(

res/ari/ari_model_validators.h

@@ -1346,6 +1346,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * Channel
  * - accountcode: string (required)
  * - caller: CallerID (required)
+ * - caller_rdnis: string
  * - channelvars: object
  * - connected: CallerID (required)
  * - creationtime: Date (required)

rest-api/api-docs/channels.json

@@ -2187,6 +2187,10 @@
 					"required": false,
 					"type": "object",
 					"description": "Channel variables"
+				},
+				"caller_rdnis": {
+					"type": "string",
+					"description": "The Caller ID RDNIS"
 				}
 			}
 		}