Like all releases in the 12.4T family, Release 12.4(22)T integrates innovations that span multiple technology areas, including Cisco IOS Security, Voice, Cisco IOS Infrastructure, Access, High Availability, Management Instrumentation, Quality of Service, IP Multicast, Broadband, IP Routing, and IP Services.
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6968/ps6441/ps9922/prod_presentation_12_4_22_T.pdf
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