Place it just after a message alert, so the question answers the ping on screen, then follow it with a short laugh or a short reply to keep the exchange moving. A WhatsApp Message Sound before it sets up the incoming chat, and Olha a Mensagem can work as a second nudge when the conversation needs another push.
关于此声音
This is a very brief Russian voice line, lasting about a second and a half, in which a speaker asks “Privet, eto kto?”, meaning “Hi, who is this?” The voice is plain and slightly baffled, as if the speaker has just picked up an unexpected call. It feels curious, wary and faintly amused, the kind of wary hello that turns an unknown caller into a small, playful confrontation.