FEATURES GUIDE

General Features
Features Guide 113
End-to-End DTMF Signalling (Tone Through)
Description
DTMF signalling is required for access to special network services offered by some telephone
companies. This system allows the digital proprietary telephone user to send DTMF signals to
the line during an established call.
Conditions
• Tone through mode is established automatically after the dialling sequence is finished and
the call is established.
• This function also applies to extension and conference calls.
Programming Guide References
No programming required.
Features Guide References
• Flexible Numbering
User Manual References
• 2.2.5 Calling without Restrictions