cmd/client/main.go                         | 4 ++++
 cmd/client/sound.go => cmd/client/audio.go | 4 ++++
 doc/proto.texi                             | 3 ++-

diff --git a/cmd/client/main.go b/cmd/client/main.go
index bd7fba6963122a32a4995bcf10b6f41b6af7ae82c99f40cd039934f416af11c6..ceb8563d6900b8893d9346053880dbfe11b74156cc793f585bd0bef589795ef1 100644
--- a/cmd/client/main.go
+++ b/cmd/client/main.go
@@ -533,6 +533,10 @@ 			n, err = opusEnc.Encode(pcm, buf[4:])
 			if err != nil {
 				log.Fatal(err)
 			}
+			if n <= 2 {
+				// DTX
+				continue
+			}
 
 			incr(nonce[len(nonce)-3:])
 			copy(buf, nonce[len(nonce)-4:])
diff --git a/cmd/client/sound.go b/cmd/client/audio.go
rename from cmd/client/sound.go
rename to cmd/client/audio.go
index d8c8bee3a77c99247c3a5a9d2ca19ffbedc1838260121f50ff823f848b999654..0b41d029eb18932a8270dd6040e0cab2ec8d33d3d3f7715577bd67754c989c4d 100644
--- a/cmd/client/sound.go
+++ b/cmd/client/audio.go
@@ -31,6 +31,10 @@ 	err = enc.SetComplexity(10)
 	if err != nil {
 		log.Fatal(err)
 	}
+	err = enc.SetDTX(true)
+	if err != nil {
+		log.Fatal(err)
+	}
 	err = enc.SetBitrate(vors.Bitrate)
 	if err != nil {
 		log.Fatal(err)
diff --git a/doc/proto.texi b/doc/proto.texi
index f3c1209edf6ca8d0370b38d3cbc33917f2e40f7164326ab22bf9fc6172c1a4d6..ead9defe774257d82ee8bf191e9c75d169ffc8181a70aa0ec57bd0892a464b81 100644
--- a/doc/proto.texi
+++ b/doc/proto.texi
@@ -3,7 +3,8 @@ @unnumbered Protocol
 
 VoRS uses Opus codec with 20ms frames with 48kHz 1ch 16-bit S-LE sound.
 It uses native @code{libopus}'es Packet Loss Concealment (PLC) feature
-if number of lost frame does not exceed 32 count.
+if number of lost frame does not exceed 32 count. DTX (discontinuous
+transmission) is also on.
 
 Each frame has single byte stream identifier (unique identifier of the
 participant) and 24-bit big-endian packet counter. Reordered packets are