On the MX (not the MR) you can enable default traffic shaping rules. I can find no documentation what these rules actually do.
For example, does class get placed into the high/medium/low queue, and if so, which queue is each placed into?
you do know what they do on mr?
i dont know..
i assumed it only marks the traffic. except for dscp 46 that gets highest prio over all other traffic at mx.
i also dont like the SIP name..
Good question and I am sure something that can be very easily added into the documentation.
For the SIP thing according to the documentation you shouldn't even need to enable default traffic shaping rules.
All incoming DSCP EF PHB's are put in an unconfigurable real-time queue. (I assume this is a strict priority queue) and the rest just gets the CBWFQ treatment.
For the rest it's just guessing at the moment.