3Com ISDN Modem ATD 1 908 555, Placing a TollMizer Call, An example is as follows:, ATD 1 908 555 1212 & 1 908 555, In this case, you would type, for example:

7-4 CHAPTER 7: PLACING AND RECEIVING CALLS

ATD <telephone number>

An example is as follows:ATD 1 908 555 1212

Some Internet service providers may require you to dial two telephone numbers to place a Multilink PPP call. In this case, the ampersand (&) character is used to dial two telephone numbers.

To automatically dial two telephone numbers, add the following to the dial string of your application software:

<telephone number 1> & <telephone number 2>

In this case, you would type, for example:ATD 1 908 555 1212 & 1 908 555 1213

Note that if Multilink PPP is disabled (i.e., S 80=0), you can still place a Multilink PPP call without changing the S 80 register value. In the dial string, enter the first telephone number, then the ampersand character followed by the second telephone number, as shown in the example above.

Placing a TollMizer Call

The TollMizer feature (also referred to as Switch 56 Permissive or Data Over Voice) allows you to place a data call using a voice channel, saving the extra cost of the data channel. Combining TollMizer with 3ComImpact IQ compression, you can transfer up to 128 Kbps of data for the price of a single voice call.

TollMizer calls may not work properly if placed via long distance carriers.

You can select this feature from the 3C882 ISDN modem’s Configuration dialog box. Once enabled, all outgoing ISDN calls will be TollMizer calls. Note that to place calls to devices which do not support TollMizer, you must disable this feature