conduct a call without using your hands. As a result, other people in
the room can also participate in the call.
Hashing
The process of deriving a number (hash) from a character string. A
hash is generally far shorter than the text flow it was derived from.
The hashing algorithm is designed so that there is a relatively low
probability of generating a hash that is the same as another hash
generated from a text sequence with a different meaning. Encryption
methods use hashing to make sure that intruders cannot change
transmitted messages.
HDLC
High Level Data Link Control
HDSL
High Bit Rate DSL
HDSL2
High Bit Rate DSL, version 2
Headset
Combination of headphones and microphone as a useful aid for
anyone who makes a lot of telephone calls and wants to keep hands
free for making notes.
HMAC
Hashed Message Authentication Code
HMAC-MD5
Hashed Message Authentication Code - uses Message Digest Al-
gorithm Version 5.
HMAC-SHA1
Hashed Message Authentication Code - uses Secure Hash Al-
gorithm Version 1.
Holding a call
A telephone call is put on hold without breaking the connection
(inquiry/brokering).
Holding in the PBX
Both B channels of the ISDN connection are needed for the per-
formance features "Call another person during a call" and "Speak al-
ternately with two people" (brokering). As a result, you cannot be
reached from outside or make external calls via your PBX's second
B channel. With this setting, an external caller put on hold hears the
PBX's on-hold music.
Hook flash
The use of the inquiry, brokerage and three-party conference spe-
cial features in T-Net and certain performance features of some
PBXs is only possible with the hook flash function (long flash) of the
signal key on the telephone. On modern telephones, this key is in-
dicated with an "R".
Host name
A name used in IP networks instead of the corresponding address.
A host name consists of an ASCII string that uniquely identifies the
Teldat GmbH
Glossary
bintec Rxxx2/RTxxx2
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