answer method

Future<CallHandleImpl> answer(
  1. String callId
)

接听（长连接可用时 rtc.join，否则 POST /client/v1/calls/{call_id}/join），成功后连接媒体。

Implementation

Future<CallHandleImpl> answer(String callId) async {
  final handle = await get(callId);
  await handle.join();
  return handle;
}