There are ten different types of 8400-Series voice terminals: the 8403, 8405B, 8405B Plus, 8405D, and 8405D Plus, 8410B and 8410D, 8411B and 8411D, and 8434DX. The 8400-Series voice terminals work in both 4-wire and 2-wire DCP configurations.
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Avaya 8400 Digital Telephones
There are ten different types of 8400-Series voice terminals: the 8403, 8405B, 8405B Plus, 8405D, and 8405D Plus, 8410B and 8410D, 8411B and 8411D, and 8434DX. The 8400-Series voice terminals work in both 4-wire and 2-wire DCP configurations.
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