IPO upgrade License history - 4.1 ^ - 4.2 ^ - 5.0 ^ - 6.0 ^ - 6.1

[FractalTelecom]

For the life of me I am trying to remember at what point you need to purchase a license upgrade, 6.0 or 6.1?

A old client I haven't heard from in years gave me their functioning IP500V2 R4.1 with VM Pro and I want to take it to the latest software available before messing with licenses.
I could load 4.2 or higher, but I no longer have a copy of 4.1 if that fails.

Does anyone remember?

 

[derfloh]

I think the latest was 5.0 but I’m really not sure

IP Office remote service
IP Office certificate check
CLI based call blocking
SCN fallback over PSTN

 

[ipohead]

I'd agree as I have upgraded an old V1 to R5.0 without needing a licence.

I thought the V2 started at R6.

 

[FractalTelecom]

I'd agree as I have upgraded an old V1 to R5.0 without needing a license."

I thought the V2 started at R6." - They originally had a 500V1, power supply crapped out. I moved them to a V2 and SD card at that point.
I'll give the R5X a try. I did find a copy of R1 on the VM Pro PC I originally installed.

Thanks!