Service monitor does not recognize any phones registered to a CUCM 6.x cluster.
1040 Sensors do recognize phones.
Any idea why the CUCM phones are not recognized ?
Spanning does not affect the phone count from a cluster and that is Wolfgang's issue. It only affects the phone count from the 1040 sensors.
A phone count of zero for a cluster usually means there are no cdrs being pushed from the CUCM 6.x.
1) Are you getting any records in the CVTQ reports?
2) Does it show success for both HTTP and CDR on the CUCM credentials page?
3) Are you sure that you have done the task of "Setting Unified Communications Manager Service Parameters" on every CUCM in the cluster as mentioned in the following url.