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
conference call?
To drop the last party added to the conference call,
press and release the switch hook button.
