my customer has complained that Telecom has been charged them huge amount of bills for their ISDN BRI link in the month of July, August and most probably this month.When quried, the Telecom blamed this has being caused by the router configurations and the calls amounts represent every call made lasting about 21 seconds and in intervals of 9 seconds, sometimes 14 seconds all hours of the day.
The ISDN BRi link is between two sites (Site A & Site B) and is a backup link to a Leased line. This link has not been utilized ever since it was commissioned as we've never had any problems with the the Leased line.
Please look at the configurations of both sites, attached, and identify to me which line in the config is causing this to happen. I'm no expert in ISDN BRI.