Grandstream adapter - strange behavior

[jshatch]

I just got my ATA today, it's one of the Grandstream devices. I'm noticing some strange behavior with it.

1) I cannot negotiate an ethernet link between it and my switch (Netgear GS108T). The lights on the ATA light up but the switch remains unlit, and there is no network communication.

2) When plugged into my router (Linksys WRT54GS) there is a link and network communication. However, when I place a call the packets look like they're being blasted all over my network (all switch ports and all devices start blinking insanely during a call).

I am going to get a LAN trace to see exactly what's going on there, but I wanted first to see if this is known / expected behavior for this ATA.