[Asterisk-Users] QOS Device?

[Me]

Here is the situation:

A T1 router going into an office which then plugs into the firewall box then 
into the switch.

None of these devices support QOS..

Is there some sort of box/device that I can place between the T1 router and 
the firewall box which will allow me to prioritize voice traffic on this 
link?

I can't change the T1 router to something that supports QOS because it has 
certain redundant features with an ISDN line which are needed.

Any help here would be appreciated!

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