Active Directory Migration

OK ill get right into it... We have two separate forests each with one domain. One Forest functional level is 2012 R2 the other 08 R2. We each have our own exchange 2010 environments that have a federation trust. There is a two way forest trusts between us. We are in the process of upgrading our phone systems and want the shoretel system to be able to integrate into each others GAL and we are being told by our phone system vendor that we will need to all be under the same forest to do this. This process is new to us and need a little direction. Is it worth bringing in a consultant to assist with the migration.  Any insight or real world experiences are greatly appropriated.
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Brian HarringtonConnect With a Mentor IT ManagerCommented:
I generally would err on the side of seeking expert, paid opinion for something of this magnitude. The trick with AD is that once you make certain changes, you can't go back. I'd want to know the potential problems before I undertook this assignment. I get the jitters when I raise the functional level of a domain, and that's a small thing.
Shaun VermaakTechnical Specialist/DeveloperCommented:
You can probably just create contacts for domain B in domain A and point telephone system to domain A.
The Sync can be done with PowerShell, MIM, etc
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