Needed to change DHCP Servers. Phones now not receiving DHCP Leases

[pedromt]

Hi,
I don't have a consistent vendor or tech support for my phone system here but recently my domain controller took a dump and it handled DHCP. This wasn't immediately apparent to me but I believe as soon as the DHCP leases expired on the phones they can no longer receive an address. I know how to get around the forms on the PBX and was hoping someone could point me to the right form to change the DHCP server address.

 

[pedromt]

Should have mentioned the phones are 5212's and 5224's. They're running off an SX-200_ICP_4.0.0.17 CX
This is what my CDE looks like:

 

[kwbMitel]

Form 47 has DHCP for the 200

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