To my knowledge, Cisco PoE switches will support all Nortel IP Phones. I asked this question earlier this year, and I seem to remember this being the response.
Cisco POE switches work with Nortel phase 2 sets without any type of splitter/adapter. Phase 0/phase 1 sets require a Powerdesine "universal power splitter" to work.
If you're buying new phones, they should all be phase 2. Be careful with any older sets, as those splitters run about $30 a piece.
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