Settings > Providers and PBXs

Providers and PBXs
In a local network (LAN), the telephone can operate as a VoIP system telephone and/or as a standard VoIP telephone.
A VoIP provider is an Internet service provider that offers Internet telephony (VoIP, meaning "Voice over Internet Protocol").
There are many providers that issue each customer their own phone number, which can be called from a land line, as well as over the Internet. Depending on the provider used, and the phone number called, these types of telephone connections may extremely cheap, if not free of charge.
Some providers give the impression that Internet telephony is totally free of charge. However, it is important to research the actual costs incurred by checking the tariff tables of the particular provider. As the connection to a land line connection is established over a gateway, the location of the gateway may affect any charges associated with the call. This applies especially to international calls that may be more expensive than simple calls on a public switched network if the gateway is located domestically.
PBXs connect different internal end devices with different public telecoms networks, enabling users to make external and internal calls. The PBXs make different ports/interfaces available for this.
To operate this as a system telephone, you require one of the following PBXs:
Moreover, the telephone can also be used as a standard VoIP telephone in the following PBXs:
To support the system telephone, the PBX needs at least the following firmware versions:

COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information V08 12/2020