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Fax Voip T.38 Modem - Virtual Fax and Voice modem for SIP / H.323 / ISDN CAPI 2.0 - Virtual COM Ports (modems)
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Virtual Modem - Use virtual modems instead of hardware to connect legacy software over the Internet.
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Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T - V150.1 MER Modem Relay Support for TDM to SIP Gateway [Support] - Cisco
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