Avaya IP Phones problem with Asterisk?

[spadekevin]

HI,

We have Avaya 4621SW phones. They work perfectly with Asterisk, after around 12 hours they lose their registration with the server, and stop functioning. If you log out and back in on the phone, all is well for another 12 hoursThe only information that has come out of debugs is once the phone stops working, we will occasionally see an "Invalid SIP Registration State" message related to the IP of the phone Any have any thoughts?

Please help.

I did not find the right solution from the internet.

Thanks!

[Vince-Whirlwind]

Sounds like the asterisk system is configured to auto-logout the phones.

Alternatively, maybe the switch has some kind of power saving mode enabled?