diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 489e64f87c..e8ca9dd0c1 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4497,6 +4497,9 @@ static void add_codec_to_sdp(const struct sip_pvt *p, int codec, int sample_rate
 	if (codec == AST_FORMAT_G729A)
 		/* Indicate that we don't support VAD (G.729 annex B) */
 		ast_build_string(a_buf, a_size, "a=fmtp:%d annexb=no\r\n", rtp_code);
+	else if (codec == AST_FORMAT_G723_1)
+		/* Indicate that we don't support VAD (G.723.1 annex A) */
+		ast_build_string(a_buf, a_size, "a=fmtp:%d annexa=no\r\n", rtp_code);
 }
 
 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format, int sample_rate,