Administrator's Guide

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Cisco Unified Attendant Console Administration and Installation Guide
OL-27293-02
Chapter 1 Product Overview
Integrating Cisco Unified Attendant Console Advanced with Cisco Unified Communications Manager
Centralized Installations and Transcoding
All Cisco Unified Communications Manager releases support the Cisco TAPI Wave Driver. Cisco
Unified Communications Manager Release 8.0 and later also supports the New Media driver, which is
the recommended means of enabling CTI ports to be activated because it allows greater scalability and
enables G729 to be used as a codec (compression type) without needing transcoding (the conversion of
the output stream of one codec into another codec).
In Cisco Unified Communications Manager Release 7.1 and earlier TAPI Wave-enabled CTI Ports are
needed for the Cisco Unified Attendant Console Advanced system to work correctly. These ports do not
support the G729 codec for a connected call. Therefore, in a centralized environment where the G729
codec is being used across WAN links, a transcoder must be installed wherever the Cisco Unified
Attendant Console Advanced server is located. This means that when a call crosses the WAN link to an
attendant’s IP Phone as a G729 call, during any subsequent call transfer, hold or park, Cisco Unified
Communications Manager changes the codec to G711 while the call is connected to the Service Queue
or Call Park Device CTI Ports.
To support G729 natively with the New Media Driver you need to do the following:
• On the Cisco Unified Attendant Console Advanced server, change the registry key
HKEY_USERS/S-1-5-20/Software/Cisco Systems, Inc./RTPLib/G729PassThrough to 1 in either
Hex or Dec, and then reboot the server.
• Ensure that the Device Pool and the region in which the CTI Port(s) are assigned is not restricted to
G729. If it is, calls will not be processed correctly, and will be unable to be redirected to the CTI
Port.
For more information on transcoding refer to the Cisco Solution Reference Network Design.
Note If you start using a different Cisco Unified Communications Manager Release, access the CUCM
Connectivity option and use it to validate and, if necessary, change the media driver, as described in
CUCM Connectivity, page 6-13.
TAPI Resilience
Cisco Unified Communications Manager enables a Telephony/TAPI Service Provider (TSP) client to
communicate with a primary and backup CTI Manager to receive CTI information. This allows the Cisco
Unified Attendant Console Advanced server and clients to carry on functioning if a Cisco Unified
Communications Manager failover occurs. The backup CTI Manager should be the Cisco Unified
Communications Manager to which the phones fail over.
Music on Hold
Cisco Unified Attendant Console Advanced supports Music on Hold (MoH) from Cisco Unified
Communications Manager. Music on hold is used in the following situations:
• When an operator holds a call
• During a blind transfer
• During a re-established transfer
• When Call Arrival Mode is selected to hold queued calls, as described in General Properties,
page 6-34.