Mitel 5220 IP Phone Logo
Posted on Aug 01, 2010
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I have plugged in my Mitel 5312 phone. I get his message: DHCP:Discovery Option 128 Missing How do I correct this?

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  • Expert 378 Answers
  • Posted on Apr 22, 2011
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My assumption is that your DHCP server isn't set up properly, or that someone has connected a Router to your network.
I suggest you contact your system administrator or vendor for further assistance.

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Phone says option 128 missing?

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