1) 7.1.2bSU1 probably doesn't have the fix you are looking for from a 6.1.4ES. So you should ask TAC to provide the full install of the 7.1.2ES that you need. So you can upgrade directly from 6.1.2 to 7.1.2ES. That way you can still back out easily should something with 7.1.2ES not be the way you want. What is the Bug ID?
2) The Jump from 6.X to 7.X is much less dramatic in SCCP versions than the jump from 4.X to 6.X so there is less of a chance of issue with this. Out of curiosity though, what IOS are you using on these devices?
3) AC should continue to function in 7.X (if you are upgrading), but will be totally removed in 8.0 so get ready to find a new solution.
That's what I can answer. Hope it helps some. Thanks!
The majority of our IOS versions are 12.4(22)T, with one 4(25b) for a bus error crash bug fix.
Interestingly, our SCCP registration shows version 3.1 (show sccp). We had this issue when we first went to 6.1(2) with our older IOS versions that didn't have any version higher than 5.x (we had to manually set it to version 3.1 for SCCP to register), but now, with no version specified, it registers as version 3.1.
I've not tried to manually set it higher (since we're on (22)T now).
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