Have you tried adder or audiomixer? <div class="gmail_quote"><div dir="ltr">symeon.mattes <<a href="mailto:symeon.mattes@gmail.com">symeon.mattes@gmail.com</a>>于2015年9月30日周三 15:18写道： </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, I'm using gstreamer 1.0 on iOS and I have used this example Tutorial for iOS <<a href="http://docs.gstreamer.com/display/GstSDK/iOS+tutorial+2%3A+A+running+pipeline" rel="noreferrer" target="_blank">http://docs.gstreamer.com/display/GstSDK/iOS+tutorial+2%3A+A+running+pipeline</a>> in order to create a pipeline and to stream my voice. I'm trying to send a DTMF tone to the other side but multiplexed with my streaming voice and not as rtp signal. Is there anyway to send e.g. audio message in an existing pipeline? Thanks -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Sending-DTMF-signal-tp4673882.html" rel="noreferrer" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Sending-DTMF-signal-tp4673882.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div>