JPCAP & DSCP

Hello there

Does anyone has an idea about how can someone can view the DSCP (Differentiated Services Code Point) field using the JPCAP library…

I try for example
if (packet instanceof IPPacket)
{
newPacket=(IPPacket)packet;
byte myByte=newPacket.rsv_tos;
…etc
}

but I get that the byte length is zero

Best regards
Spirus