./bin/gst-launch rtpbin localport=5000 rtcp-support=false add-destination=127.0.0.1:5001 ! rtpgsmdepay queue-delay=1000 ! gsmdec ! audioconvert ! alsasink sync=true

./bin/gst-launch filesrc location=./anastacia.8kHz.wav ! wavparse ! audioconvert ! gsmenc ! identity sync=true ! rtpgsmpay ! rtpbin localport=5001 rtcp-support=false add-destination=127.0.0.1:5000