Alcatel Temporis IP800 Administrator's Manual page 70

Call Waiting Configuration
To enable/disable Call Waiting via Phone interface you need admin or var rights:
Press Menu soft key->2.Features->2.Call Waiting and press OK key.
Use the navigation keys or Switch soft key to enable/disable call waiting.
Use the navigation keys and Switch soft key to enable/disable the Play Tone option.
This option is used to define whether to play ring tones when there is an incoming call
during an active call.
Press OK key to save the changes, or Back soft key to return to the previous menu.
To enable/disable Call Waiting via Web interface:
Choose Phone->Features->Call Waiting and perform necessary changes.
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Temporis IP800 Administrator Guide Ed1.0