This counter tracks the number of BGREJ (Begin Reject) PDUs received on this port, per the description, meaning the far end has refused this port's attempt to establish the SSCOP signaling link. If this counter is nonzero while the port keeps generating BGN attempts, the signaling channel to that peer will never come up until the underlying incompatibility (commonly a protocol parameter or UNI version mismatch) is resolved on one side or the other. This is a configuration-mismatch signal rather than a transient error to simply wait out.