EXFO FTB-800 Series for FTB-1 - Manual (Page 477)

Test Control
NetBlazer 467
Headset/DTMF Button
Headset/DTMF Button
Note: Only available with ISDN PRI test application.
The Headset/DTMP allows to connect a B-Channel (Speech or 3.1 kHz) to
the headset and DTMF tones can be generated using the keyboard.
Enable/Disable Headset and DTMF

Enable Headset and DTMF button is used to enable the Headset and
DTMF on the selected channel. The button is only available when one
or more Speech or 3.1 kHz calls are active, otherwise the button is
grayed out.

Disable Headset and DTMF button indicates that the Headset and
DTMF is enabled on the selected channel. Tapping on the Disable
Headset and DTMF button disables the Headset and DTMF from the
selected channel.
Channel
Allows to select the channel used to connect the Headset and DTMF. Only
active Speech and 3.1 kHz channels are displayed. Other channels
including the D-Channel will not be available.