Motorola SM56 Speakerphone Modem: Motorola's SM56 modems are available for use on PCI, and AC-Link (including CNR and MDC) PC's. The SM56 modem is a feature-rich, V.90/V.92 modem at an attractive price. It supports all fax and data fall back modes, and different driver installs include telephone answering machine (TAM) operation and full speakerphone functionality.