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-rwxr-xr-xchannels/chan_sip.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 2de41da8e..9d80d00b8 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4265,6 +4265,9 @@ static void add_codec_to_sdp(const struct sip_pvt *p, int codec, int sample_rate
ast_build_string(a_buf, a_size, "a=rtpmap:%d %s/%d\r\n", rtp_code,
ast_rtp_lookup_mime_subtype(1, codec),
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", rtp_code);
}
static void add_noncodec_to_sdp(const struct sip_pvt *p, int format, int sample_rate,