Terms and definitions in messaging
Multichannel messaging service is based on a variety of telecommunication and Internet technologies. In the description of services, we often use abbreviations that may not always be known to you. Here we have compiled a glossary of terms and definitions used in the industry.
A visitor location register (VLR) is a server in a cellular network that supports roaming functions for users outside the coverage area of their own Home Location Register (HLR). The VLR uses Signalling System 7 (SS7) to obtain information about the user from the HLR, and then establishes a temporary record on the VLR while the user is within the VLR coverage area, ensuring mobility management and call-handling functions.