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Glossary

Telecoms terms and abbreviations can be a little confusing, even for the most experienced engineers. Here’s a short glossary of some of the terms we use.

H

H.323
An ITU-T suite of protocols designed for controlling multimedia communications over IP
HDLC
High Level Data Link Control
HLR
Home Location Register
An HLR is a central database in a GSM network that stores all permanent subscriber data and the relevant temporary data of all subscribers.