Hi @Rafiki. A missed Ring indicates that the button on your Ring Video Doorbell was pushed, an event was recorded, but the notification on your mobile device did not answer it. This is normal behavior for your Ring Video Doorbell and does not impact how it functions.
At this time we do not have an external siren for the Ring Alarm system. As we value your feedback, we've created a Feature Request board. Feel free to add this and any future feature requests there. This will help us to organize and share your requests with our teams here, as well as allow other neighbours to comment and add interest, all in one place. Feel free to link that post you make in the Feature Request board here so other neighbours that come to this thread can easily find your feature!
The answer that Kudos was given was rubbish. The concept of a doorbell is simple. If someone rings it you go and anwer it, not search around for a pesky mobile phone which might not be swiched on anyway in "normal" households where a land line is more convenient.