So I'm a sole sysadmin, which means that while I manage our voip system my knowledge of it is undoubtedly less than most of yours here...

Anyways, I'm seeing seemingly random reboots on Polycom desk phones (Soundpoint 2201) across our office. System is all running off POE (injector, not switch) with a Switchvox PBX. My first thought was the injector was failing, but the fact that one phone at a time would die not the whole system made that seem unlikely. I've continued to see reboots even on units where I've hooked up a power adapter as a test case. That said, I don't know if the units prioritize one power source over another-I haven't tried the phones on a non-poe network as that would put them on the office LAN rather than the VOIP LAN (physically different segments) and I'd need to rewrite the firewall rules to allow them to connect...

Anyways, the system has worked well for a number of years. Reboots started happening maybe -3 months ago now, and I've seen at least 4 units suffer from this issue in this time frame, all in different areas. The reports are always of a reboot during a call-though whether it only happens during a call or whether that's the only time it gets noticed and reported to me is anyone's guess. Is it the units failing? Something in my infrastructure? What can I be doing to test this further?

Thanks!

Edit: As pointed out below, I had the wrong phone model-these are all SoundPoint IP 601 SIP phones.