Cisco Agent Desktop and CTIOS Toolkit Desktop act as call and agent
control entity and requires Callmanager to perform IP Audio routing.
See the Solutions Reference Network Design (SRND) for an overview of
Unified Contact Center Enterprise (UCCE).
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/ipcc_enterprise/srnd/75/ccsrnd75.html