We have a BCM 400 tied back to a 1000M and are having difficulty in getting caller ID working both ways across the trunks. It seems that from the 1000M to the BCM it works fine but from the BCM back no information is displayed? The set is CSE not SL1. Also, when the I2004 phone is dialed to the BCM 400 it flashes but doesn't ring? Any sugeestions?