Is there a max packet size in Silverlight Polling Duplex?

Is there 开发者_如何学Pythona max packet size in Silverlight Polling Duplex? My client code -which just simply prints the item count of the pushed list to a label- does work for 500 items in list but does noting (not event hitting the breakpoint in PushReveived event) for 1000 items. I checked the packet sizes in Firebug, 500 items weight 36 KB and 1000 items weight 72 KB.