why won't my phone ring when I call it?

My phone fell off a table here in my living room, but I can't find it.

So I tried to call it, but I hear nothing and it goes to voicemail.

It is a relatively new phone and I've only gotten calls on it when I was holding it and the prompted on the screen instead of ringing.

I have a wireless house phone with 3 hand sets. I can dial any handset from another and use it's ringing to find/home in on it (all within the house). But when I try calling my iphone, I hear nothing.

It seems like it must have fallen down behind something. Is there something apple can do to make it ring instead of going to voice? I set it for the classic "ring" in the notify menu -- wanted it loud in case I was in other end of house. Calls coming in on the land-line ring all extensions unless I've silenced them, so no prob, but the iphone I thought I might not hear if it was in my purse and in the other end of the house.

It's like I need a scaled down type of find-device tag for items in the house. I looked at the find-my-device app, and it offered to show me where my house was on a map, but not the device at the location.

Is there some reason why it wouldn't be ringing or something support could do to make it ring or make some other noise.

tnx...