This is just a basic beep from a phone. I guess i figured freesound didn't have enough beeps, so i uploaded this. I believe it is in c#, but there is a possibility i am mistaken.
Recorded this with zoom h6 + ntg3. Did some postproduction (just eq) because of the noisy environment. First 4 beeps contain reverb information, last 4 beeps are isolated (dry).