I'm replacing 3800 with 4300 isr router. Is there anything I need to look at? The 3800 router is H.323 Talking to voice provide with T1. I know 3800 uses vwic and 4300 uses NIM . Is the connection different? Is there anything I need to consider?
Since you are migrating Service from 3800 and 4300, as long you have configuration ported to new 4300 with latest version of IOS code, you are good.
check the compatablity with Provider circuits with modules you installing on 4300.
If possible if you have test Circuit to test on 4300 is good. is the only 3800 in the network Serve the calls, do you have any other device where you can divert the calls while you doing this migration ?
if this is the only device then do in maintenance window, with backup plan.
Thank you so much . They Don't have another ISR to have calls diverted while doing this. There will be a down time. Does anyone have a check list that can share when doing this sort of work? Replacing/migrating an ISR ?
As long as you check the compatability and business agreed downtime, good to go for migration.