also: いんしん
There has been no word from him at all.
We have been out of touch for a while.
音信 is a more formal, often legal or literary word for correspondence, while 便り is the everyday, warmer term.
no communication; out of touch; not hearing from someone
Standard kanji spelling; the reading おんしん is the most common.
Rare reading; おんしん is strongly preferred in modern Japanese.
音 (sound, news) + 信 (message, trust). The combination originally referred to news or a message conveyed by sound or writing.