Thanks for reply.I have noticed that we upgraded the call manager from 5 to 7 ,version for IP phone models 7941,7961 and 7970 are showing SCCP41.8-3-2S while in compatibility guide it shows 9-0-2-2SR1.Even though phones are working.
What u are trying to say it is best pratcie to upload the exact compatible versions of IP phones before upgrading the call manager else we can upgrade the call manager first and if required, upgrade ip phone firmware later on
Whether it's best practise to do the phone firmware upgrade first or notdepends on your environment.
I have a large(ish) cluster, so I prefer to do the firmware upgrades before. But for a smal cluster, it probably isn't worth it.
Do check, though, whether you need to go through the 8.5.2 firmware version first. You appear to be running an old firmware rev (8.3.2S), so may not be able to upgrade to something more recent without going through this intermediate step first.
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