SIP Traffic and Jitter & shoretel

Getting a number of users complaining of poor voice quality.
I have spoken to both our comms and phone suppliers, not much help.

i've been notified of issues at both our sites.  Both sites are configured the same (in terms of hardware) the phone system is shoretel.
The l3 switch going through a cisco asa firewall is an hp 2910 al poe.  Routing all traffic to the firewall.
The only different i can see is the remote site has not got QOS enabled to Differential Services.  SHould this be enabled in order to help jitter at site b?

What else can i check/enable to help with jitter.
Our 10mb links are running at about 2mb on average.
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CHI-LTDAsked:
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getzjdCommented:
Do you have MPLS and COS enabled between those links?
Does this occur both intrasite and intersite?
Have you enabled QoS priority on the hp 2910 for voice traffic?
What is your disserv setting in ShoreTel (call control --> options) ?
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CHI-LTDAuthor Commented:
no we have a 10mb link over vpn.
both sites.
yes, and just enabled diff-serv on the other switch that had issues
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getzjdCommented:
So if a user at site B calls another user also at site B, they receive jitter?    

Do you have QoS applied to the VPN tunnel between sites?   If these are standard internet lines, you will be at the mercy of the internet as soon as your data leaves the modem/router
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CHI-LTDAuthor Commented:
no internal seems more reliable.
i believe the firewalls do priority os have say 2mb dedicated to voice.
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CHI-LTDAuthor Commented:
would a higher compress codec e.g. 729 help?
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CHI-LTDAuthor Commented:
would qos on a link thats not being hit hard still help?
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