Here is a doc which talks about setting up UCCX span based monitoring on UCS C series.
http://www.cisco.com/c/en/us/support/docs/customer-collaboration/unified-contact-center-express/118160-configure-uccx-00.html
May not be supported on UCS B series blades:
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/recordng.html#pgfId-1112070
NoteSPAN-based silent monitoring and recording is not supported on the UCS B-Series chassis.
-Terry
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