Cisco Cisco IOS Software Release 12.2(4)YB

The following sections list the new hardware and software features supported by the Cisco 1700 series 
routers for Release 12.2(4)YB.

The following sections describe the new hardware features supported by the Cisco 1700 series routers 
for Release 12.2(4)YB.

Release 12.2(4)YB supports 1- and 2-port analog modem WAN Interface Cards (with part numbers 
WIC-1AM and WIC-2AM, respectively) on Cisco 1720, 1721, 1751, and 1760 routers. The interface 
cards provide basic telephone service connectivity for remote router management; asynchronous 
Dial-on-Demand Routing (DDR) and dial backup; dial- and fax-out modem access; and low-density 
remote access server (RAS) services. 

This feature supports the following functionality:

Internal analog modem dialup capability

Support for speeds up to 56K (V.90 specification)

1- and 2-Port Analog 
Modem WIC

12.2(4)YB

Yes

Yes

Yes

Yes

Yes

Yes

Yes

G.SHDSL WIC

12.2(4)XL

7

12.2(4)YB

Yes

Yes

Yes

Yes

Yes

Yes

No

1.

In Cisco IOS Release 12.2(2)XT, the feature name “Cisco IP Keyswitch Version 2.0” changed to “Cisco IOS Telephony Service Version 2.0" and the 
command mode changed from “keyswitch-configuration mode” to “telephony-service configuration mode”.

2.

This feature was introduced on Cisco 1751 routers in Release 12.2(2)XT.

3.

This feature was introduced on Cisco 1760 routers in Release 12.2(4)YB.

4.

This feature is supported on Cisco 1760 routers on Release 12.2(4)YB and above only. Release 12.2(4)XM does not support this feature on Cisco 1760 
routers.

5.

For a list of the SIP features, see

 Table 2, Footnote 1

6.

For a list of the MGCP features, see 

Table 2, Footnote 2

7.

This feature was introduced on Cisco 1720, 1750, and 1751 routers in Release 12.2(4)XL.