Lync Mobile App not working without WIFI

HI,
we have Lync 2013 deployed and everything works fine. We can do Voice Calls, Video Calls etc.
But when we switch off the WIFI and only 3G or 4G is enabled, we can call persons, but after we accept the call, it gets terminated and we can't hear each other.
any idea?
EDIT: We get the error "Could not establish a connection"

Hi repa1982,
Since A/V is now supported over 3G/4G, or Wi-Fi the Edge Server plays a larger role in mobility deployments. In the diagram below, you can see that the mobile client will still send signaling information via the Reverse Proxy, but it will now send media
via the A/V Edge interface on the Edge Server:
Click the link below for more information.
Lync 2013 Mobility
http://blogs.technet.com/b/dodeitte/archive/2013/02/27/lync-2013-mobility.aspx
Best regards,
Eric

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