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Troubleshooting Cisco IP Phone Registration Problems with Cisco CallManager 3.x and 4.x
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This document discusses and solves the most common problems that cause Cisco IP phones to fail to register with the Cisco CallManager.
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www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml
26 May 2009
This document explains the recommended workaround for the Registration Rejected: Error DBCo error message. You might receive this error message when the IP phone auto-registers to the Cisco Unified Communications Manager.
www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080874bf1.shtml
11 Mar 2009
Find software and support documentation to design, install and upgrade, configure, and troubleshoot the Cisco Unified IP Phone 7900 Series.
www.cisco.com/en/US/products/hw/phones/ps379/tsd_products_support_series_home.html
12 Sep 2012
Cisco CallManager 4.x has a new concept called Unassigned Directory Numbers (DNs). When a DN gets removed/updated from a device or a phone gets deleted, the associated DNs are not removed from the Cisco CallManager database as in earlier versions. They...
www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a008073f588.shtml
03 Jul 2007
...2008 Troubleshooting Cisco IP Phone Registration Problems with Cisco CallManager 3.x and 4.x 26/May...Information For Troubleshooting 13/Nov...
www.cisco.com/en/US/products/hw/phones/ps379/prod_tech_notes_list.html
25 Apr 2005
After a Cisco CallManager upgrade, some IP phones do not download the new IP phone load from TFTP and do not register with the Cisco CallManager. This document discusses and provides a resolution for this issue.
www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00806d774f.shtml
10 Oct 2006
This document explains how to configure and capture traces from the Cisco CallManager server for Cisco Technical Support. When you call Cisco Technical Support, you can be asked by the Technical Support engineer to capture these traces in order to troubleshoot the problem.
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www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080094e89.shtml
12 Feb 2007
Cisco 7940/7960 IP phones can support either the Skinny Call Control Protocol (SCCP) to run with Cisco CallManager, the Session Initiation Protocol (SIP) (refer to RFC 2543), or the Media Gateway Control Protocol (MGCP), but not more than one simultaneously.
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www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080094584.shtml
20 Mar 2009
This document answers some of the primary questions about Music On Hold (MoH) in Cisco CallManager 3.x and 4.x. Refer to Cisco CallManager Administration and System Guides, Release 3.1, 3.2 and 3.3 and the Release Notes for Cisco CallManager...
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www.cisco.com/en/US/products/sw/voicesw/ps556/products_qanda_item09186a0080094766.shtml
01 Jul 2011
Cisco Unified Wireless IP Phone 7920
www.cisco.com/cisco/web/support/model/tsd_hardware_unifiedipphone_model_7920.html
19 Apr 2013
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