Well, the tech support of the STB has finally answered. The problem is solvable quite easyly. I just have to add
Code:
<Property>
<Name>forceMPEGTSOut</Name>
<Value>true</Value>
<Type>Boolean</Type>
</Property>
<Property>
<Name>rtpWrapMPEGTS</Name>
<Value>true</Value>
<Type>Boolean</Type>
</Property>
to the RTP/Properties section of the application's config file. Now the STB plays the RTSP stream.
By the way, where can I read about these advanced properties? The user manual says nothing about them. Is there some sort of "advanced user manual" or "wowza for admins" book?