Was wondering if anyone had a similar issue. Outgoing calls worked, but ALL incoming calls went straight to failover to my cell phone. I unplugged the power to the grandstream 502 and re-powered it back up. All seems to be fine now. Anyone know if there were any maintenance or similar scheduled that may have "Burped" the connection. This is the 1st issue I've had with the 502, so I don't think it's a NAT issue or anything. Thanks... Mike....