DHCP - supporting two Default Gatways - is this possible?

We are using SBS 2011.

We have just had a new telephone system installed. The supplier was determined to put their phones on the same range as the computers. It transpired on investigation that they had introduced their own DHCP server onto the network, which explained a load of oddities that started.

Is it possible to configure the DHCP so that particular machines, say based on their MAC, can be given a different Default Gateway?
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edhastedAsked:
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KimputerCommented:
SBS 2011 DHCP server allows for RESERVATIONS. These are indeed based on MAC  address, and each RESERVATION you set, will start with the default scope settings. But after you add it, you can configure it to have a different gateway (or noted as 003 router)

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edhastedAuthor Commented:
Sorry I've never doen this before.

My 003 router is set to the current Default Gateway.
If I reserve an IP with a MAC and then set up a different Default Gateway how do I do this as 003 is pointing at the original?
KimputerCommented:
Right mouseclick on the reservation then Configure Options. Everything you put in now, will overwrite all earlier settings.
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edhastedAuthor Commented:
So this will keep the original Default Gateway for the bulk of the network and only give a proscribed Default Gateway to the reserved/MACed items?

Sorry for being pedantic.
KimputerCommented:
This will ONLY change the default gateway FOR THAT SPECIFIC reservation where you right clicked on. If you have a lot of phones, you have a lot of clicking and entering the IP to do.
edhastedAuthor Commented:
Understood - many thanks. Ed
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