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CUCM cluster upgrade 5.1.3 to 6.1.3

Hi,

Follows are my upgrade plan and need confirmation whether its okay.

1. get the media and license via PUT

2. download 6.1.3 image into PUB and SUB both without restart

3. version change in PUB and SUB, and restart both servers in same time - Is this okay restart in same time?

4. apply feature license and verify CUCM service status.

Thanks in advance,

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