Saving bandwith will not necessarily improve your voice quality unless you have a small amount of bandwidth to start with and need to run more calls than you can support.
If you aren't getting consistent voice quality now, then implementing any compression will not help - with MPLS your sites are not directly connected, so you do not have full control over what is sent out on the link from the PE router to your on-site router, and no control over how traffic is treated as it goes throught the SP's network.
The only way to assure your voice quality is to work with your SP to get QoS properly implemented.
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