Information Technology Reference
In-Depth Information
routed to all the non-negative priority devices the user is logged into, instead of routing
only to the highest-priority device. (Non-negative means devices that are not explicitly
blocked from receiving messages.) CUPS delivers messages to all the logged-in devices for
a user (this behavior is called IM Forking). When the user replies on a particular device,
subsequent messages are sent only to the device used for the reply. Backward compatibil-
ity for SIP-only Presence clients (such as CUPC 7.x) is provided via an IM gateway.
Voice Calls
CUPC supports voice calls in deskphone mode or softphone mode. Voice encryption us-
ing Secure Real-Time Protocol (SRTP) is supported. Survivable Remote Site Telephony
(SRST) is supported in softphone mode with appropriate CUCM/CSF configuration.
CUPC supports the following codecs in softphone mode:
G.711 a-law, mu-law
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G.722 Wideband
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G.729A, G.729B
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iLBC (Internet Low Bandwidth Codec)
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iSAC (Internet Speech Audio Codec)
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Codec support in deskphone mode depends on the IP phone model.
Video Calls
CUPC supports video calling in either deskphone or softphone mode. In deskphone
mode, CUPC uses Cisco Audio Session Tunnel (CAST) and Cisco Discovery Protocol
(CDP) for communication between the IP phone and the computer running CUPC. The
desk phone must be enabled for video support in CUCM. SIP desk phones are not sup-
ported by CAST.
In softphone mode, CUPC uses the CSF device configured on CUCM for video calls. CSF
devices are video-enabled by default.
Video conferencing is supported, using a video-conference bridge accessible by the Media
Resource Group List (MRGL) assigned to the IP phone or CSF device.
Integration Support
CUPC can integrate with many Cisco Unified Communications applications, providing a
wide range of rich features. CUPC can provide visual voicemail when integrated with
Cisco Unity or Unity Connection. Users can control their mailboxes and listen to, send,
and delete messages using CUPC.
Click-to-call functionality is supported from CUPC and other applications, such as Mi-
crosoft Outlook, Word, and Excel. Presence indicators for contacts can also be viewed in
Outlook. If Cisco Unified MeetingPlace is integrated in the system, a call in CUPC can be
easily escalated to a conference.
