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May 17, 2012


Paul Slade

Excellent article. We spent all day trying to get a new Mitel phone system installed because the IP Phones couldn't discover the DHCP server.

The issue was the DHCP options as we use a Win2008R2 DHCP server and VLAN's across multiple sites.

After reading you article we got it working! Mitel Support in the UK couldn't fix the problem!


iOS Application Developers

Now, I suspect many phones act this way, as it sort of makes sense. Is there a configuration file to look into? It's quite possible things are in there to define what VLAN it should use for the PC port.

John White

Anyone get the error "tftperr: Packet Send" after following these instructions? Its getting one the right vlan etc... not sure what I am missing.


Great writeup! Do you know, do the Mitel phones work with the "switchport voice vlan " command on interfaces? I know this is typically how we set things up in a Cisco environment but not sure if it would play well with Mitel stuff or not... An example of this would look something like:

interface FastEthernet0/7
description Mike's phone
switchport mode access
switchport access vlan 1
switchport voice vlan 4

Tonym Pa

Excellent article and instruction on this, what should otherwise be, a simple process.

Before finding this article, I spent the better part of an entire weekend, plus the Monday afterwards, searching google, digging through forums, testing phones, and calling every Mitel support tech who speaks Layer 2 and 3 that I could find.

What ended up saving us was your procedure (with the Magic Mitel String :) ) and a DHCP Helper Address entered into the router.

Phone system

The information regarding Mitel IP phone system seems to be great.we using so many IP phone system with different facility which they provide on it.But after reading this blog for the mitel IP phone system which you provide them with a static IP on the same VLAN as the rest of the network is interesting.

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Don't stress yourself out in finding a way to solve this experimentation. Time will be the best solution there. Take it easy and for sure, you can find what you are looking for.


I wrote a similar article to this a little while back on doing DHCP with linux or Cisco DHCP services rather than windows. Check it out at http://technologyordie.com/mitel-phone-dhcp-configuration-with-multiple-vlans


Excellent article.

I have been trying for months to move DHCP from the Mitel controller to our own microsoft dhcp server because I wanted to make use of the superscope option which the Mitel controller does not have. I was battling to get this to work.

I was just on the verge of calling a consulting company, when I came across this blog. I have actually saved my company some few bucks.


 Sunil Shirurkar

Thanks Steve , I got clear idea

Rodrigo Rojo

Excellent article! It was something I thought dominate.
I just migrate a domain from Windows Server 2000 to Windows Server 2008 R2 happening, of course, for Windows Server 2003. Everything has been great and we have corrected the details have been me. The company has urged Mitel PBX, one 3300, with about 320 IP phones. Everything works fine, just 5 IP 5224 phones are not working. We have reviewed the DHCP option 43 and 125 and is correct. It also works for other phones. Also, on each terminal or position where the phones do not work, they have tried other phone and operating properly.
If I connect one of these devices, which do not work, live telephone VLAN, then working properly, but not on the corporate VLAN. Only occurs 5 IP phones 5224 and another 25 are connected properly.
I thought it might be something with the OS version of the IP phone. What do you recommend we do?
My personal email is rodrigorojo2000@gmail.com
Best regards.

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  • Steve Friedl is a software and network security consultant in Southern California. He has been a C and UNIX developer since 1981 and has an exceptionally broad background in this area. Some areas of expertise include:

    • C and C++ systems software development on the UNIX and Win32 platforms
    • Communications, including serial and TCP/IP based controllers
    • Enterprise internet security administration and configuration
    • Penetration tests, audits, and network reviews
    • Security forensics, reverse engineering, and tools development
    • General UNIX and Windows system/network administration
    • The Windows Printing System
    • Database software development
    • Technology problem solving and research
    • Technical writing and standup training

Unix Wiz

Stephen J. FriedlSoftware ConsultantOrange County, CA USASteve@unixwiz.net