Supplementary Voice Features

6-3

The analog method for disabling Call Waiting, typically *70, is not available for ISDN. Instead, you must set the appropriate S Register (S76) to activate or deactivate the Call Waiting feature. Refer to Appendix B,“AT Commands, S Registers, and Result Codes” for the appropriate values.

Troubleshooting

What if the call is busy? The 3C882 ISDN modem supports two simultaneous voice calls per voice port. If you already have two calls up (e.g., one active and one on hold), any incoming calls will be rejected (i.e., the caller hears a busy signal). An incoming call will also be rejected during an outgoing call that is not yet active, or while your telephone is ringing for an incoming call.

If you should hear the Call Waiting indicator when attempting to dial a third party, the Call Waiting takes precedence.

Call Conference

Call Conference (also referred to as Three-Way Calling or TWC) is a voice call feature that allows you to add another party to an existing call. This feature can be used whether you have received or have placed the first call.

You cannot conference two incoming calls. You must initiate the third call in order to activate Call Conferencing.

Table 6-2 How to Use Call Conference

How Do I

Do This

 

 

Place a new conference call?

While the first call is active, press and release the

 

switch hook button. The B channel LED light flashes to

 

indicate that the first call is on hold, and you will hear

 

a dial tone. Then dial a third party number.

 

After the third party has answered, press and release

 

the switch hook button to connect all three parties.

Drop the last party added to the

To drop the last party added to the conference call,

conference call?

press and release the switch hook button.