Your planning to do SIDE B devices so no need to stop A side services. Disable configuration changes on SIDE-A router( DBMaintenance)
For changing the IP and Hostname for SIDE – B devices.
Once completed SIDE-B devices no need to start services. Stop SIDE-A services and open web setup for Router, Logger and AWD change SIDE-B Private & Public Ip address or Hostnames. For PG , CTI, Dialer re-run the PG setup and do the same.
Verify DNS forward and reverse lookup Devices name and Ip address in Domain controller. And modify local host entry for ICM servers ( if applicable)