U-verse Business Service In A Residence With Existing U-verse Home Service

I have a client who's had a Home Office for many decades now.  He's had U-verse Home Service for years now (2 VOIP lines and internet) but now he'd like to convert his existing AT&T Business POTS line to U-verse VOIP as well (an installer told him AT&T was going to force him to do this in the not-too-distant future so he thought he'd go ahead and get it over with).  However, I've heard conflicting stories about whether you can have both Home U-verse and Business U-verse service at the same physical address but in this case he has no choice.  Again, this is a residence, not a business but it has a dedicated Home Office contained within.  Please advise as to how he can go about doing this.  Thank you.