Okay so the issue was the NBN in Australia is the government wholesaler, and they have Traffic Classes which some Service Providers leverage.
The Fixed Wireless Service provider we switched to was using this - and it detects DSCP markings and prioritises DSCP 46 as TC-1.
Only problem is the NBN have only allowed 150kbps for Fixed Wireless connections =/ There is no way for the RSP to change that.
What a fail.
So basically I need to remove the DSCP markings from the phones.
I could do that on each phone...or I was thinking maybe the edgerouter can strip them for me??
Anyone know?