How can I improve VoIP call sound quality?

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If the problem is echo and it is happening within your building – return loss in your cable plant is the likely culprit – you can buy an expensive echo canceller or have your cables reterminated and tested (generally FAR cheaper). If the problem is jitter and delay, the solution could be as simple as putting your voice equipment on a VLAN and increasing the priority at which those packets are transmitted. You will also want to look at a few other things like making sure that your subnet is not too large, that all of your devices handle QoS and that they are layer 3 devices.