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Cisco IOS Software Releases 12.1 Special and Early Deployments

Cisco IOS Software Release 12.1(2)XF

Document ID: 20312

Early Deployment (ED) Release Summary

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Description of the Release

Cisco IOS® Software Release 12.1(2)XF is a short-lived release (XED) based on 12.1(2)T. It has been optimized to provide enhanced voice and voice applications for the Cisco 800 series of router (811 & 813), which targets small office and home office (SOHO) market. Another major addition to this code is the support of the Japanese INS-NET-64 switch standard. This makes it possible to support more features including Japanese caller ID display.

The Cisco 800 series router introduced with Cisco IOS Software Release 12.1(2)XF comes both with S/T and U Interfaces.

The two models are:

  • Cisco 811 (1E, S/T, Y, Console Port, No Pots, No Hubs)
  • Cisco 813 (1E, S/T, Y, Console Port, 2 POTS and 4 Ethernet Hubs)

Both models have 8 MB DRAM, upgradable to 16 MB & 4 MB FLASH, upgradable to 12 MB.

They also support three Extra switches with Normal/Reverse, DSU "ON/OFF", & S/T Termination switch.

The following links provide more information:


Product and Feature Support

Major New Features


  • Japanese INS-NET-64
  • Call Blocking on Caller ID
  • Local Call Waiting (The user has the option to place the current call on hold by pressing flash key, connect to the incoming call, and then switch back to the current call)
  • E Ya Yo (This feature allows an outgoing call's caller ID to be invisible to the receiving device. It is activated by dialing the prefix "184" specified in the NTT user manual before dialing the receiving device's number)
  • Voice Warp/Voice Select Warp (This feature- NTT defined- is supported only when the Japanese INS-NET-64 Switch is connected to the router.)
  • Nariwake (This feature allows mantis platform to register multiple Caller ID numbers with the ISDN (NTT INS-NET-64) switch based on router's local directory numbers. When calls are presented to the NTT Switch with a Caller ID identified on the list of registered numbers, the NTT switch will send a message to the mantis platform to notify the router that it should provide a distinctive ring to its telephone port to which the local directory number just called will be routed)
  • Trouble Call Blocking
  • I Number (allows several terminal devices to be used with one subscriber line)

Note: Most of the above features are activated ONLY when the global command "pots country JP" is configured in the router.

Cisco 811 & Cisco 813 Router Images:

IP: c800-y6-mw

IP/IPX: c800-sy6-mw

IP/IPX: c800-nsy6-mw PLUS

IP/Firewall: c800-oy6-mw



IP/IPX/Firewall/IPSec PLUS: c800-nosy656i-mw

Based On (root)

Ported Into

Synchronization Points with Major Releases

Cisco IOS Software Release 12.1(2)T

Cisco IOS Software Release 12.1(4)T

Release Type

Cisco IOS Software Release 12.1(2)XF is a one-time release or XED.

Target Market

Cisco IOS Software Release 12.1(2)XF is for use by Enterprise, Network Service Providers, ISP, SOHO, and SMB.

Maintenance Releases

There are no maintenance releases for XED.

Projected Cisco IOS Release Dates

Interim Builds

There are Weekly Builds. IOS XED does not provide interim builds; they may provide rebuilds to address catastrophic defects.

Customers are advised to upgrade to the next fully tested maintenance revision.

Recommended Customer Migration Path

Customer Upgrade From

Customer Upgrade to

Cisco IOS Software Release 12.0(1)XB

Cisco IOS Software Release 12.1(2)XF, 12.1(4)T

Cisco IOS Software Release12.1(2)XF

Cisco IOS Software Release 12.1(4)T

The recommended migration path is the logical superseding release, which brings additional features and hardware support to the network without loss of previously configured functionality.

Life Cycle


Y2K Compliance


Other Dates

CCO FCS:5/30/00






MFG FCS:6/06/00


CCO Address





Updated: Feb 28, 2002 Document ID: 20312

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