The BELCOM-ISDN "PLUS" PABX systems have a Multiple Operator Technology.

They were developed to access several operators both of the fixed (conventional and ISDN) and the mobile network, and to make available those channels simultaneously to extensions. The terminals can make and receive direct calls from the fixed and mobile networks.

In case they are busy, the calls are not diverted to the electronic mailbox of the Operator.

Common mobile telephones can also be integrated in the system, being configured as one more extension of the PABX system.

BELCOM-ISDN "PLUS" terminals through the Three-Channel + Very High Speed Technology are the communication highways of the 21st century.

They possess three high-speed simultaneous communications channels in both directions, transmitting voice at 64 Kbits/sec, and receiving and transmitting data, fax and image. This quantity of communications channels allows that each telephone, even when it is being used, is never busy. The Very High Speed multi-channel can be configured for 10 Mbits/s, 100 Mbits or Ethernet Gbits (in agreement with the integrated data network), provides telephone functions in the entire computer network and high-speed Internet access.