The English connotations of that are about a person who is overly loud, it wouldn't typically be used to describe someone
"Crier" is the closest if you're looking for a word along those lines, since it has historically been used in that way, although it's not a modern term.
There's a reason "herald" comes up here, though - it's actually a pretty close fit.
Your earlier suggestion of "announcer" works, though. "Reporter" might be even better, since it tends to imply a news context. You might say "telephone reporter" alone, for example, but you'd probably need to say "telephone news announcer" if you wanted to avoid it sounding like you were talking about someone who reads e.g. the time over the telephone.
"Shouter"?
The English connotations of that are about a person who is overly loud, it wouldn't typically be used to describe someone
"Crier" is the closest if you're looking for a word along those lines, since it has historically been used in that way, although it's not a modern term.
There's a reason "herald" comes up here, though - it's actually a pretty close fit.
Your earlier suggestion of "announcer" works, though. "Reporter" might be even better, since it tends to imply a news context. You might say "telephone reporter" alone, for example, but you'd probably need to say "telephone news announcer" if you wanted to avoid it sounding like you were talking about someone who reads e.g. the time over the telephone.