Cisco Cisco IOS Software Release 12.2(4)YB

Caveats describe unexpected behavior or defects in Cisco IOS software releases. Severity 1 caveats are 
the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious 
of these three severity levels.

Caveats in Release 12.2 T are also in Release 12.2(4)YB. For information on caveats in Cisco IOS 
Release 12.2 T, refer to the 

document. For information on caveats 

in Cisco IOS Release 12.2, refer to the 

document. These documents 

list severity 1 and 2 caveats, and are located on CCO and the Documentation CD. 

If you have an account with Cisco.com, you can also use the Bug Toolkit to find select caveats of any 
severity. To reach the Bug Toolkit, log in toCisco.com and click Service & Support: Technical 
Assistance Center: Tool Index: Bug Toolkit. Another option is to go to 

http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl

.

This section describes unexpected behavior that is fixed in Release 12.2(4)YB.

An error can occur with management protocol processing. Please use the following URL for 
further information:

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903

This section describes unexpected behavior in Release 12.2(4)YB.

Booting a Cisco 1700 series router using the command boot system tftp might not work due to 
insufficient memory. To work around this problem, use the command tftpdnld from the ROM monitor.

To properly shutdown MGCP, first shut the voice port associated with MGCPAPP and then issue the 
command no mgcp. If the voice port is not shut, issuing the command no mgcp causes MGCP processes 
to shut down incorrectly. This has been observed when RQNT with embedded notifications is issued by 
the call agent.