The IP500 V2 supports analog extensions via the "Phone 8" card (Option B), which provides 8 analog ports for devices like single-line phones or fax machines. Option A (TCM8) supports digital stations (e.g., Avaya 9500 series), Option C (DS16) is for digital extensions, and Option D (ATM4) is for analog trunks, not extensions.References: Avaya IP Office IP500 V2 Installation Manual.
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