4From the Protocol tab, select the ISDN connection protocol that you want to use (it must match the protocol on the receiving system). Follow the guidelines below.

Note: the sample above depicts the International version of the DIVA T/A Configuration Tool. If you’re using the North American version the V.110 option is not accessible.

Note: the Enable Always On / Dynamic ISDN (AO/DI) option is only available if the firmware you are using supports it and you have subscribed to it with your ISDN Service Provider.

Protocol Guidelines:

For most connections, Multilink PPP is used (PPP is the default for International Firmware). If it is not supported, use PPP (for single B-channel connections), V.120, or V.110 (International Firmware only).

Both PPP and Multilink PPP require that a PPP communications stack be installed on your computer (for example, Dial-Up Networking).

Notes:

To obtain maximum Multilink PPP performance, you need a PC equipped with a UART 16650 (you might need to install a fast com port card), which supports COM port speed of 230.4 kbps (versus 115.2 kbps with 16550).

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Hayes Microcomputer Products DIVA T/A ISDN manual Diva T/A Isdn Modem User’s Guide