Single user at remote site with Cisco ASA 5505 connecting to our corporate ASA 5510 over an IPSec site-to-site tunnel.
This user, about once a week, has the phone reboot and display this error. Today, the phone has not booted all day and continually reboots after this error.
IP is statically assigned, no vlan or PRI options set, and ICP/TFTP address set to the 3300 controller.
I've read about everything I could on this, from inspection maps on the ASA for SIP traffic, to potential packet sizes for the TFTP from the 3300 coming in at 1522 which would fragment on the 1500 MTU ASA.
Any ideas? I'm now exploring setting up the Teleworker portion of the phone, though we don't have the module, as I understand it has longer timeout and "jitter" periods.