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Appendix
Dial-up network
Your computer can use the Microsoft Windows dial-up network facility to connect to
an Internet service provider via a modem.
DTMF
Stands for "dual tone multi-frequency," also known as voice frequency dialling. The
dialling signals and control functions are transmitted in the form of tones at various
frequencies.
DTMF post-dialling
DTMF post-dialling is only possible during an external call when, for example, an
automatic announcement prompts you to post-dial digits and symbols (1 - 0, * and
#), during fax polling or other applications, e.g. T-NetBox.
ECT (Explicit Call Transfer)
An ISDN feature enabling two external calls to be switched together in the telephone
exchange.
E-mail
E-mail is a written message transmitted via an on-line service or the Internet to
another subscriber’s e-mail address. The e-mail protocols used in the Internet enable
the attachment of data (pictures, programs, etc.) to the e-mail.
Enquiry
You can hold a call and make an enquiry call to another internal or external sub-
scriber, then return to your first call.
Exchange
A node in the public telecommunications network.
External line access
External line access levels regulate access to an external line. You can, for example,
specify which subscribers are not allowed to make long-distance calls.
External line seizure
Depending on the configuration, an external line can be seized automatically or by
dialling 0. This means that when you want to make an external call and you lift the
handset, you hear an external dialling tone either immediately or after dialling 0.
IAE
This is a unit consisting of the socket and plug for connecting ISDN devices in
Deutsche Telekom’s ISDN.
ISDN
ISDN stands for "Integrated Services Digital Network."