Any model of modem that connects to a hardware COM port or creates COM ports in Windows will work with TacServe Modem Pool Server.The only requirement is that the modem must be able to connect to the endpoint. For example: If the remote modem requires a V.22bis connection, make sure that the modem in the TacServe PC supports V.22bis connections.For large TacServe configurations, Tactical Software recommends the following modem cards:Analog: Comtrol RocketModem (4 and 8-port models) and the Multi-Tech MultiModem (4 and 8-port models).Digital: Dialogic DivaServer (formally Eicon DivaServer), configurations range from single to multiple T1/E1s per card.If you have any questions, please contact Tactical Software Support at support@tacticalsoftware.com