Hi,
the mediaproxy-module in 3.3 branch establishes a single shared connection to the mediaproxy dispatcher socket before sip-router is forking sub-processes. This leads to race-conditions when multiple calls to use_mediaproxy() are made in parallel. The fix is simple, it seems it was just forgotten to restrict the opening of the dispatcher connection to subprocess initialization. Patch attached.
Regards,
Emil Kroymann