Snom ONE IP Technical Manual page 208

DND (Do Not Disturb)
A feature that prevents an extension from ringing. DND functionality allows
users to silence their phones for all incoming calls, even calls made to a hunt
group or an agent group, and takes precedence over call forwarding. DND can
be configured with an override permission that allows a designated extension to
call an extension that has been placed into DND. The DND button can be used
to activate DND on a single phone; however, a user will need to activate the *78
star code so that the system will know to put the extension and any additional
phone number(s) that have been configured through it into DND.
DNIS (Dialed Number Identification Service)
A telephone service that identifies for the receiver the telephone number that was
dialed by the caller. Once the call enters the PBX system, the DNIS will identify
which number was dialed and record that information.
DNS (domain name system)
The Internet's name/address resolution service that translates alphabetic domain
names into numeric IP addresses. For example, the domain name
com might translate to
user's web browser will not be able to find web sites and the user will not be able
to receive or send email. The DNS system consists of three components: DNS
data, name servers, and Internet protocols for getting the data from the servers.
Domain name server
A computer that runs a program that converts a fully qualified domain name
(FQDN) into its numeric IP address and vice versa.
DTMF (Dual-Tone Multi-Frequency)
The signal that is generated when a user presses the touch keys of an ordinary
telephone. Also known as "Touchtone," DTMF has essentially replaced pulse
dialling. When a user presses touch keys, two tones of specific frequencies are
generated (one from a high-frequency group and the other from a low-frequency
group), so it's impossible for the voice to imitate the tones.
198.105.232.4 . If a computer cannot access DNS, the
539
www.pbx.