Shadow network for bypass detection

摘要

According to the invention the system (1) for detection of a bypass (540) comprises a shadow network (10S, 20S) for verification purposes, said shadow network (10S, 20S) comprising at least a further means (10S) adapted to originate a shadow test call to said telecommunication network (50) under test from outside the telecommunication network (50) under test and a at least a further receiver probe (20S) with a subscription for terminating said shadow test call, between which low volume shadow test calls are setup.