diff --git a/daemon/codec.c b/daemon/codec.c
index 2a0d96864..ad637f9ea 100644
--- a/daemon/codec.c
+++ b/daemon/codec.c
@@ -2227,10 +2227,12 @@ static int packet_dtmf(struct codec_ssrc_handler *ch, struct codec_ssrc_handler
 					ret = 1; // consumed
 				else
 					ret = packet_dtmf_fwd(ch, input_ch, dup, mp);
+				mp->ssrc_out->parent->seq_diff++;
 
 				if (ret == 0)
 					__transcode_packet_free(dup);
 			}
+			mp->ssrc_out->parent->seq_diff--;
 
 			// discard the received event
 			do_blocking = true;
diff --git a/t/auto-daemon-tests.pl b/t/auto-daemon-tests.pl
index 1b31979da..d6b73b83c 100755
--- a/t/auto-daemon-tests.pl
+++ b/t/auto-daemon-tests.pl
@@ -1066,12 +1066,12 @@ snd($sock_a, $port_b, rtp(101, 1028, 6040, 0x1234, "\x03\xa6\x03\xc0"));
 rcv_no($sock_b);
 # send audio, receive end event
 snd($sock_a, $port_b, rtp(8, 1029, 7000, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(101, 1029, 6200, 0x1234, "\x01\x8c\x03\xc0"));
+rcv($sock_b, $port_a, rtpm(101, 1030, 6200, 0x1234, "\x01\x8c\x03\xc0"));
 rcv($sock_b, $port_a, rtpm(101, 1031, 6200, 0x1234, "\x01\x8c\x03\xc0"));
-rcv($sock_b, $port_a, rtpm(101, 1032, 6200, 0x1234, "\x01\x8c\x03\xc0"));
-rcv($sock_b, $port_a, rtpm(101, 1033, 6200, 0x1234, "\x01\x8c\x03\xc0"));
 
 snd($sock_a, $port_b, rtp(8, 1030, 7160, 0x1234, "\x00" x 160));
-rcv($sock_b, $port_a, rtpm(8, 1034, 7160, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(8, 1032, 7160, 0x1234, "\x00" x 160));