bandwidth shaping for Video conference

I have 1.5 Mb bandwidth available for my 100 + users, i want to allocate 512 kbps permanently for my polycom video conferencing facility on priority basis when video conference is in progress, else available for user, any config suggestions appreciated.


queue simple> print
Flags: X - disabled, I - invalid, D - dynamic
0 X name=“queue1” dst-address=0.0.0.0/0 interface=all parent=none packet-marks=dlz direction=both
priority=8 queue=default-small/default-small limit-at=1000/1000 max-limit=1000/1000
total-queue=default-small

1 name=“Polycom” target-addresses=x.x.x.x/32 dst-address=0.0.0.0/0 interface=internal
parent=none direction=both priority=1 queue=default/default limit-at=768000/768000
max-limit=768000/768000 total-queue=default-small time=0s-1d,sun,mon,tue,wed,thu,fri,sat

2 name=“Local” target-addresses=192.168.100.0/24 dst-address=0.0.0.0/0 interface=lan parent=none
direction=both priority=8 queue=default/default limit-at=2000000/2000000
max-limit=2000000/2000000 total-queue=default time=0s-1d,sun,mon,tue,wed,thu,fri,sat


Polycom has been allotted 768 on priority 1
Local Users has been alllotted 2 M on priority 8

please advise if any any changes required
Thanks,

Aggy