I

Glossary > Glossary > I

Internet Message Access Protocol - protocol to download e-mails from a server, with extended functions as compared to POP3 (e-mails are stored on a server, not on the client PC, so that they cannot be lost due to a failure of the client PC).

Unique numerical address within a TCP/IP network that is assigned to one device and ensures that data packages reach the correct recipient.

The telephone uses the IPsec protocol to transport IP packages cryptographically secured via public networks.

IPv4 addresses comprise four numbers between 0 and 255 that are separated by a point, for example, 192.168.0.14. The network addresses are divided up into different classes (Class A to C) depending on how many computers can be located in a network.

Certain ranges are reserved for the operation of local networks:

•

Class A: 10.x.x.x (for networks with up to 16.5 million PCs)

•

Class B: 172.16.x.x to 172.31.x.x (for networks with up to 65534 PCs)

•

Class C: 192.168.0.x to 192.168.255.x (for networks with up to 254 PCs)

These addresses have no validity on the Internet; this means that data packets with this sender type or recipient address cannot be transported on the Internet. However, they can be used in local networks without restriction. The advantage of this is that if data from a local network configured in this way comes in contact with the Internet, none of the data on the computers in the local network can leak out or be accessed externally.

Integrated Services Digital Network) - digital network that combines the different communication services, e. g. telephony, telefax groups 2 and 3, data transmission, etc. Unlike analogue networks, ISDN uses digital transmission.

COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information V03 12/2020