[asterisk-users] 7960 Won't Register Yet Multiple Attempts?

[robert.norton at sophmedia.com]

Hi List,
I've got a 7960 that's behind NAT (nat_enabled: 1 and
nat_received_processing: 1) and for whatever reason doesn't seem to
register, or at least hold a registration. If both the phone and the
router (netgear) are rebooted, the phone will register, take a few
incoming/outgoing calls no problems, then a few hours later, it drops the
registration and never re-registers. If the phone itself is rebooted, I
see a mess of registration attempts via SIP channels:
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER
7X.183.246.XXX   (None)      000e8XXX-5d  00101/00220  unkn  No       Rx:
REGISTER

Is there something that I'm missing. Short of replacing the customers
router (which I have admin access to) is there anything else I should try?
Any sort of packet filtering is disabling, nat is enabled in the SIP
config, and port forwarding was also setup to forward 5060-5070 TCP and
10000+ UDP to the phone to no avail.

Note that if the phone is plugged directly into the customer's modem (thus
removing the router out of the picture) the phone works perfectly.

Thanks - Any input is appreciated

-Robert Norton