Wiktionary
value-added network
n. A communications network that had additional functions such as error correction, protocol conversion and message storing.
Wikipedia
Value-added network
A value-added network (VAN) is a hosted service offering that acts as an intermediary between business partners sharing standards based or proprietary data via shared business processes. The offered service is referred to as "value-added network service".
Usage examples of "value-added network".
With room 2 as the number of record I called a value-added network, one of those companies which channels your local call into long-distance modem connections.