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Originally Posted by DPGumby  I think earlier Mitel used a couple of DHCP options that have more recently become more popular in IT circles for something else. Option 125 can now be used as a replacement should you find the other options already in use |
Yes, the previous DHCP options that were used to set up the Mitel IP phones were re-allocated by a new RFC a few years ago, took Mitel a bit to get the firmware in place to play nice with the new standard.
Basically any phone that works with 6.1 and up should work either with the old DHCP options (128-133) or the new (43 or 125).
Also, if you're using an external DHCP server, I've run into issues with Windows and Linux servers not working with option 125, and having to use 43 for these configurations.