I have to disagree with the 'before throwing complexity into the network' it isn't doing what you want it do (delivering voice clearly) and is more than capable of doing so if properly configured. No matter how much bandwidth you have on your links, if the network doesn't see voice traffic any different than coping a large file from a file server then you are likely to have voice quality issues from time to time. You can leverage the network investment you have by making it perform the very best it can (with what you have). As networks grow in an ad-hoc fashion without proper planning they eventually reach a point where such an exercise becomes necessary. If you are not familiar with QoS (and yes the extra complexity that comes with it), go take a course (as opposed to just diving into the deep end) or retain the services of a reputable network engineer to redesign the network properly. While some people might suggest just throwing more bandwidth at it, VoIP will work well on a very oversubscribed T1 (1.44 Mbps) with QoS properly configured.
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