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Updated:November 25, 2016
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Note When Cisco 4000 Series Integrated Services Router is configured to use Network Address Translation (NAT) along with Unified CME 10.5 and later releases, we recommend that the ip nat pool overload command is configured to ensure that IP phones (applicable only for SIP Phones) successfully register on Unified CME. Also, ensure that the source IP address defined for Unified CME using the command source-address is excluded from the IP pool used for NAT.
The Cisco 800 Series, 2900 Series, 3900 Series, and 3900E Series Integrated Services Routers platforms require 1 GB of DRAM and Cisco 4000 Series Integrated Services Router platforms require 4 GB of DRAM.
The following Cisco Integrated Services Router platforms are supported:
Cisco 800 Series Integrated Services Routers
Cisco 2900 Series Integrated Services Routers
Cisco 3900 Series Integrated Services Routers
Cisco 3900E Series Integrated Services Routers
The following Cisco 4000 Series Integrated Services Router platforms are supported:
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Determining the Software Version
To determine the release of Cisco IOS software currently running on your Cisco router, log in to the router and enter the show version command. The following sample outputs from the show version command indicates the Cisco IOS release on the first output line:
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn.
Extension Assigner provides support for automatically synchronizing configuration changes to backup systems for SIP Phones. For more information on support for Extension Assigner application on SIP Phones, see
Support for Redundant Cisco Unified CME Router on SIP Phones
Sites can be set up with a primary and secondary Cisco Unified CME router to provide redundant Cisco Unified CME capability. SIP Phones automatically register at the secondary router if the primary router fails and later rehome to the primary router when it is operational again. For more information on support for Redundant Cisco Unified CME Router on SIP Phones, see
Support for Voice Hunt Group Enhancements on SIP Phones
Voice hunt group features such as Hlog support on SIP phone, DND Softkey as Hlog, Members Logout, Auto Logout, Presentation of calls, and Dynamic Agent Join or Unjoin Status message display on SIP phones is now supported. For more information on support for Voice Hunt Group enhancements on SIP Phones, see
The secondary dial tone feature is now supported on SIP Phones. For SIP phones, a dialplan file is downloaded when the phone restarts. Based on this dialplan pattern, phone would collect the digits or play secondary dial tone if there is a comma (,) in the pattern. For more information on support for Secondary Dial Tone on SIP Phones, see
The Call Transfer Recall feature returns a transferred call to the phone that initiated the transfer if the destination is busy or does not answer. For more information on support for Call Transfer Recall on SIP Phones, see
Support for Transcoding on Cisco 4000 Series Integrated Services Router (ISR)
Transcoding is supported on Cisco 4000 Series Integrated Services Router using the LTI transcoding infrastructure. For more information on support for Transcoding functionality for Unified CME on Cisco 4000 Series Integrated Services Routers, see
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies.
Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
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Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.