What about if the call/text is during the daytime, but it interrupts the receiver at work or during a nap?
(Inspired by how my friend keeps berating me for contacting her when she's napping but refuses to set her phone on silent "in case something important happens." I never know when she is napping, and not only do text/calls wake her up, she apparently has noise alerts on her phone for email and Facebook messages as well! ETA: I don't call/text her at night . . . but it seems reasonable I should at least be able to email her then?).