Fax Voip T.38 Modem allows to use different Fax Modes, depending on the Call Routing. For example, all calls to numbers starting with '00' can be redirected to Betamax/Dellmont SIP network as G711 fax calls, and all calls to numbers beginning with '1' can be redirected to T38FAX SIP network as T38 fax calls. Thus, to configure outgoing faxes, editing of Outgoing VOIP Call Routing table is required. To configure incoming faxes editing of Incoming VOIP Call Routing table is required. To avoid possible problems with selecting correct Fax Mode, it is strongly recommended to pre-read detailed descriptions of the possible Fax Modes. See also Voice Codecs requirements chapter.