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Chapter 4 Cisco Call Back
Introducing Cisco Call Back
4-2
Cisco CallManager Features and Services Guide
OL-4660-01
Introducing Cisco Call Back
The following sections provide information about the Cisco Call Back feature:
• Overview of Cisco Call Back Architecture, page 4-2
• Cisco Extended Functions Service Dependency, page 4-5
• Multiple Cisco Extended Functions Applications in a Cluster, page 4-6
• How to Use Cisco Call Back, page 4-7
Overview of Cisco Call Back Architecture
The Cisco Call Back feature uses the Cisco Extended Functions (CEF) service.
The CEF service comprises the following interfaces:
• Cisco CTIManager Interface (QBEHelper), page 4-3
• Cisco CallManager Database Interface (DBL Library), page 4-3
• Call Back Handler, page 4-4
• Screen Saver and Call Back Dictionary, page 4-4
• Redundancy Manager, page 4-4
• DB Change Notifier, page 4-4
• SDI Trace and Alarm, page 4-5
The CEF service interfaces with the phone by using the XML services interface
(XSI) over skinny protocol (a protocol that is used between a Cisco IP Phone and
Cisco CallManager) and the Quick Byte Encoding protocol (a protocol that is
used between the Cisco CTIManager and TSP/JTAPI). See Figure 4-1.