CCM Upgrade to 6.x

[Phoneguy69]

We are currently looking toupgrade from our existing CCM ver. 3.3(3)sra4 to 6.x.
We are changing out all of our routers before the upgrade and I want to make sure the IOS will not affect anything on the current 3.3 ver.
My question is what IOS ver. will have to stay at with the new routers until we upgrade to the new CCM Ver.??

Any help is much appreciated.
Thanks

 

[globalchicken]

Are your gateways MGCP or H323?

 

[Phoneguy69]

They are H323 and majority of our remote sites have 4 lines w/fxo modules. a few have fractional T-1's

 

[globalchicken]

I found this link

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a008009428e.shtml

This just says various versions of 12.2.

 

[Phoneguy69]

Thanks. It led me to the CCM Compatability matrix, but some our current routers, soon to be replaced are on higher versions than what it states for 3.3(3).
Not sure if that means I have a problem and it hasn't reared its head yet or higher IOS versions are ok.

Anyway, thank you for your reply.

 

[globalchicken]

Seeing that your Gateways are H323 and call processing is done on the device itself, i would not see an issue here.