Gateway Entrance and exit, transition point
Half duplex Bidirectional communication method in which it is only possible to
either send or receive at a particular point in time. Also known as
Simplex.
Handheld unit Mobile component of wireless telephone units. In the event of digital
transmission, it is also possible to make telephone calls between the
handheld units (DECT).
Hands free If the telephone has a microphone and speaker installed, you can
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
Funkwerk Enterprise Communications GmbH
Glossary
bintec W1002/W1002n/W2002/WIx040/WIx065 395
To Next Page
Loading...
