[cisco-voip] INSTALLING PRI MODULES

[anand]

Hi

I want to install 2 port T1/E1 ISDN PRI modules on my 3845 routers.Currently
i have 12.4(15) T  ios version on my router but cisco recommends 12.4(20)
T.Do i need to upgrade my IOS version or can i work on my current version of
IOS.Any suggestions please ?

thanks
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