I would upgrade everything first, tn2302's tn799, G700's if any and your IP phones. When you have you're "conversation" up go in the back of you're phone and try pinging the voip resource and the other phone and see what you come up with.
Post back with more info, types of phones, voip resources involved, network regions and codec's used. I don't have much to go on here. Make sure your voip resources are set to 100MB/FD too.
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