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Thank you for asking this question in the support community. From the information you've provided, it sounds like you may have the incorrect NetVanta unit for this application. My recommendation would be to contact ADTRAN applications engineers for assistance with selection of products for your network design and application. However, in the meantime, you can use the traffic-shape rate <value> command to limit the output bandwidth (and due to TCP windowing, it should reduce the input as well). Also, verify that the Quality of Service (QoS) is setup properly for the VoIP. Here is the Configuring QOS in AOS for reference.
Do not hesitate to reply to this post with any additional information or questions. I will be happy to assist you in any way I can.
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