That is the correct layout. I am assuming that since the traffic is hitting the router with voice coming in priority, there should be enough bandwidth on the thernet side. But the voice quality issues that have been reported seen to say otherwise. There is choppy audio inbound to the site, but outbound to the PSTN is fine.
regarding your problem description it seems that you have an QoS problem at the headquater outside direction or T1 leased line. since you cannot prioritize incoming traffic, your router at the branch office cannot supply QoS to incoming traffic.
first you can check the interfaces involved to ensure CRC or leased line errors. then you can look at the service policy output at HQ to see if you have drops at class LLQ
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