In OBi forum, one guy had issues like yours and it turned out his Internet router is at least 5 years old. Internet traffic is fine but VOIP not. He bought a new one and the problem is gone.
Change your Internet router to a newer one
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• 回複:Change your Internet router to a newer one -yiping911- ♂ (106 bytes) () 04/06/2011 postreply 12:15:59