Chapter 3: Operate the system
Use a phone or fax machine 43
3333
Dialing prefixes
Apart from the numbers above, you can use the following dialing prefixes
before the number:
Prefix Function
1* Forces the connection to use Standard Voice.
2* Forces the connection to use 3.1 kHz Audio.
#31# Hides the caller’s phone number to the recipient.
*31# Shows the caller’s phone number to the recipient
where it would otherwise be hidden, e.g. because the
number is an ex-directory number.
R The following key-presses should activate a
supplementary services function supported by the
system. These function are described in the following
sections.
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