Guys.. I just noticed that my grandstream handytone 286 ata are having problems with voice cutoffs... We can listen to the person on the zap channel (x100p cards) without problems but they sometimes listen to us with cutoffs.. like "He ...lo..... ow...r.. you" and it comes and goes.. this doesnt happen all the time but often enough. Any ideas what might be happening or what do I need to send you to help me debug this issue... Thx Guys! BTW, my ATAs are using ulaw.