Question about Mitel 5220 IP Phone

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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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  • 378 Answers

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.

Posted on Apr 22, 2011

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1 Answer

Phone says option 128 missing?


This is the option in the DHCP Server to instruct the phone what the Control Unit ip address is so the firmware can be updated/checked. to resolve this you will need to add the option in the DHCP server

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