Chapter 3: Calls, faxes and SMS
54 Use a phone or fax machine (SBU)
Dialing prefixes (SBU)
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.
Which key works as a button to activate supplementary services
varies from phone to phone. To find out which button activates
supplementary services on your handset, refer to the phone’s user
manual. On some digital phones, an R button functions as this
button (like for the Auxiliary Handset). On analog phones without
a dedicated hold button, a short press on the hook button triggers
this function (this is called the flash button on analog phones).
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