Antenna splitter
Also known as an antenna combiner. Connects antenna outputs from a GSM device into one antenna (in order to reduce the number of antennas for one device). It is used primarily for rack sets to reduce the number of cables leading to the server rooms.

Auto CLIP Routing
The GSM Gateway automatically stores information about outgoing calls. If somebody calls back, they are automatically routed to the extension that the previous call was made from.

Baby Call function
Automatic call without dialing the number. Intended especially for the elderly or disabled in case of emergency.

CallBack
Function for reducing call costs (particularly when roaming); when an employee of a given company calls his firm’s PBX from abroad, the call is not connected and the PBX calls him back – the employee can then dial any number and it is as if he called from his company (when roaming, an incoming call is always cheaper than an outgoing call).

CDR (Compact Disk Recordable)
Information about the duration of calls, called number, caller, time of call, etc.

DialThru function
If a GSM Gateway has two ports, it is possible to connect it between a PBX and the network without the need to program the PBX (change settings).

Internal Voice Mail
Internal function of a PBX which enables the recording of voice messages for the called person during his absence.

Interactive Voice Response (IVR)
A primary navigation tool for the caller enabling his call to be directed to the right department using assigned codes (often used in banks, contact centers).

Least Cost Routing (LCR)
LCR is a function of a gateway/PBX which selects the cheapest possible route for calls (e.g. a call from a fixed line to a mobile phone is sent via the GSM network to avoid the higher call charges of using the fixed line network).

Mobility Extension
The redirecting of an office line to a mobile, which also allows the user to use all the PBX functions from a mobile! It is used especially when away from the office, and unlike DECT it is not limited to a certain range and the user does not need another phone, just his standard mobile.

Modularity
Attribute of a product which enables expanding or changing the product depending on the growth of the company (number of users, functional requirements).

SNMP monitoring
Online monitoring of a telecommunication device via the TCP/IP protocol (LAN/Internet).
STUN services
It helps a VoIP device to determine a change in the IP address of the router, connecting the VoIP device to the Internet (if the Internet provider in the given country uses dynamic IP addresses).

VRRP (Virtual Router Redundancy Protocol)
Non-proprietary redundancy protocol designed to increase the availability of the default gateway servicing hosts on the same subnet. This increased reliability is achieved by advertising a “virtual router” as a default gateway to the host(s) instead of one physical router. The physical router that is currently forwarding data on behalf of the virtual router is called the master router. Physical routers standing by to take over from master router in case something goes wrong are called back-up routers.