Cisco 7206 VXR QOS Issues with PA-MC-T3 T1's

I am currently running 20 T1's through a Multi Channel T3 Card in a 7206 VXR Router.  The VXR Router has an Asterisk PBX Connected to it through a PA-4E (4 Port 10MHZ) Interface.  One of the T1's runs to a remote office and we are having Voice QOS Issues.  The traffic on the T1 to the remote office can be very low but we have trouble when a lot of traffic is going through the router to and from all the other T1's.  What I need to know is the simplest way to provide Priority to the SIP Packets on the VXR Router.  I am currently running IOS Version 12.1(9).
hgallagherAsked:
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pjtemplinConnect With a Mentor Commented:
class-map match-all voip
  match ip precedence 5
policy-map ee-qos
  class voip
    priority percent 20
  class class-default
    fair-queue
!
int <serial-int>
 service-policy output ee-qos
!
end
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hgallagherAuthor Commented:
Will this work with the 12.1(9) IOS?
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hgallagherAuthor Commented:
Do I apply this to all of the T1's?
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pjtemplinCommented:
If it doesn't, you've got one more good reason to update it.  I'd be on 12.2(40) or 12.0(27)S5 if I were you.
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Sean64Commented:
I agree with the above.  It's a good solution for voice prioritization.  However, just a thought:  Check the ethernet interfaces on the router, try to put them into full duplex mode.

i.e.
interface ethernet 3/1
 duplex full

Duplex problems can degrade the quality of your voice traffic when collisions occur.  Especially if you are sending large quantities of voice data on that link.

I would reccomend upgrading the IOS as well.  At least to a 12.2 revision.
Also if you can, you could upgrade that interface card to a PA-FE-TX (only 1 port, but 100Mbits and full duplex)
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pjtemplinCommented:
Use the policy on any interface where you want COS5 packets prioritized.
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