Sipura SPA-3000 spontaneous reboots, reason 0x737208f4

I have a 10-year-old Sipura SPA-3000 VoIP phone adapter (SIP to FXS phone) which at some point started rebooting once an hour, even during calls. After enabling remote syslog, I saw that these reboots happen with no prior indication, and after the reboot, I see the following message:

Jun 16 21:15:16 192.0.2.2 logger: <134>System started: ip@192.168.0.101, reboot reason:H737208f4
Jun 16 21:15:16 192.0.2.2 logger: <134>System started: ip@192.168.0.101, reboot reason:H737208f4

These hexadecimal reboot reasons don’t appear to be documented anywhere, the only list I could find appears to refer newer models and doesn’t contain 0x737208f4.

After some trying, I figured out that if I disable DHCP, the reboots don’t happen anymore. My DHCP always assigned the same IP to the device, so I really see no reason why it would have to reboot.

 

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