receiving multiple audio streams by RTP and play them simultaneously

[ge_keep]

I am trying to playback simultaneously 2 differents wav audio streams
received from 2 differents sources sending RTP packets... kind like a 3-way
telephone conversation where you can hear the 2 far-end callers if they talk
at the same time even if it is annoying!

I made following simulation with 3 test boards (let's name them EVM1, EVM2,
EVM3) running linux+Gstreamer:
the host (receiver) test board is EVM1 with ip address=192.168.1.101.

1) I setup up EVM1 as RTP streams receiver:
gst-launch-0.10 -v udpsrc port=5555 caps="application/x-rtp" ! rtppcmadepay
! alawdec  ! alsasink

2) The 2 other EVMs (EVM2 and EVM3) start sending RTP stream (differents
audio streams for example)
 - on EVM2: gst-launch-0.10 filesrc location=audio2.wav ! wavparse !
audioresample  ! alawenc ! rtppcmapay ! udpsink host=192.168.1.101 port=5555
- on EVM3: gst-launch-0.10 fileserc location=audio3.wav ! audioresample  !
alawenc ! rtppcmapay ! udpsink host=192.168.1.101 port=5555

>From EVM1 audio Output, I am able to hear both audio sound coming from EVM2
and EVM3 at the same time, but the first audio playback that I started
(audio2.wav from EVM2) sounds very corrupted as soon as I started the second
audio playback (audio3.wav from EVM3). So only audio3.wav sounds good while
audio2.wav sound corrupted at the same time as audio3.wav is playing.

My goal is to hear both audio simultaneously from EVM1 (even if it is not
intelligeable) as in 3-way phone call, but it seems to me that EVM2 and EVM3 
RTP streams may need to be mux and demux somewhere?

Is any gstreamer expert can give me a hint on how to achieve this task?



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