Record Sound on Android

[Puyol]

Hello,
when i use 
Android: 
  openslessrc ! audioconvert  ! audio/x-raw-int, channels=1, rate=16000 !
rtpL16pay ! udpsink host=10.10.10.100 port=5000

Receive: 
gst-launch-0.10 -v udpsrc port=5000 caps ="application/x-rtp,
media=(string)audio, clock-rate=(int)16000, channels=(int)1,
payload=(int)96"  !   rtpL16depay ! audioconvert ! alsasink sync=false

in Android I face an error : Error received from element openslessrc0 :
Could not negociate format 
did any one know what's the problem, Thanks!



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