ISDN CAPI 2.0 Settings

Fax Voip T.38 Console supports 2 different methods of fax transmission via ISDN CAPI 2.0 connection:

• CAPI Fax. This method is commonly used by the standard CAPI 2.0 fax applications. It is based on the CAPI 2.0 specification. Fax is transmitted according to B3 Protocol 4: T.30 for Group 3 fax or according to B3 Protocol 5: T.30 for Group 3 fax extended. To send and receive faxes, special SFF (Structured Fax File) file format is used. To configure CAPI fax, follow instructions in the CAPI Fax Settings chapter.
• Fax over G.711 (audio). When sending/receiving faxes using this method, Fax Voip T.38 Console does not use fax features of your ISDN card, as it is usually done in the CAPI 2.0 fax applications. Fax is transmitted as standard audio data. Fax Voip T.38 Console operates the same way like analog fax machine that connected to the ISDN line via adapter. Fax Voip T.38 Console uses the same technology that is used when transmitting audio faxes via SIP or H.323 (Fax over G.711 codec).

To select between CAPI fax and G.711fax, you should configure Fax mode in the Fax Settings (Outgoing VOIP Call Routing) or Fax Settings (Incoming VOIP Call Routing).

ISDN Username (number)

This option enables to include Calling Number (CallerID) in the CAPI 2.0 message when doing outgoing call. By default Fax Voip T.38 Console uses Default Username specified in the VOIP settings as ISDN number but you can override it in this field. On the other side, this parameter can be overwritten by the Outgoing Call Routing settings. Username consisting of letters is ignored, so digits should be used to include CallerID in the CAPI 2.0 message. Depending on the properties of your ISDN card, CallerID can be ignored and overridden. If you enter an incorrect ISDN number that does not satisfy your ISDN settings, the outgoing call can be rejected. Note that when using username consisting of letters, such error is not possible.

Use Default Username

To modify ISDN Username (number) field, uncheck this option. If this option is checked, Fax Voip T.38 Console will use the Default Username specified in the VOIP settings as ISDN Username (number).

Voice codec

CAPI 2.0 applications expect and provide voice data coded according G.711 A-law or according to G.711 u-law. Select the G.711 codec that shall be used on your system.

CAPI Profile

In this area you can view detailed information about ISDN CAPI 2.0 subsystem used on your computer. This indicator works when the Fax Voip T.38 Console Service (Fax Voip T.38 Console application) is running and Enable ISDN CAPI option is checked (see more details in the VOIP Settings chapter). The following information can be displayed:

• CAPI status: Connected OK / Failed to connect...
• CAPI manufacturer
• CAPI version (including manufacturer version)
• ISDN controllers – number of ISDN controllers
• Number of B-channels for every controller

Notes

• To be able to operate with ISDN line via CAPI 2.0 interface, you must have ISDN card in your computer and install CAPI 2.0 driver (capi2032.dll) supplied by the manufacturer of your ISDN card.
• Should understand that some CAPI 2.0 drivers do not allow the simultaneous use of CAPI 2.0 interface for more than one CAPI 2.0 application.