Can you please give us a little more information on how the device is configfured, what call control you are using (VCS/CUCM/Standalone), are the calls purely within their network, or is it external calls that are the issue (could be firewall or NAT issues?). What is the device at the other end and is it running recent a software release?
Without much detail it's a little difficult to help find the cause of your problem.
Wayne
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Wayne
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