受付 うけつけ不可 ふか信号 しんごうでしょう
kikōketsukefukashingōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 着呼受付不可信号

1. Probably unreceivable call signal.; Likely a call acceptance blocked signal.

Polite
Presumptive
Conjecture
Computing