Cisco Cisco IOS Software Release 12.4(2)XB6

VPN routing and forwarding (VRF) divides a physical router into multiple logical routers, each having 
its own set of interfaces and routing and forwarding tables. Adding VRF-awareness to voice gateways 
allows a voice gateway to exist in the same router as a customer edge (CE) or provider edge (PE) WAN 
router.

The VRF-Aware H.323 and SIP for Voice Gateways feature adds single voice VRF support to 
session-initiated protocol (SIP), H.323, and IP-to-IP gateways and to Cisco Survivable Remote Site 
Telephony routers. For more information, see the following link on Cisco.com:

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco 
MIB Locator found at the following URL:

If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of 
supported MIBs and download MIBs from the Cisco MIBs page at the following URL:

 

To access Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your 
account information, send a blank e-mail to 

. An automatic check will verify 

that your e-mail address is registered with Cisco.com. If the check is successful, account details with a 
new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com 
by following the directions found at this URL:

There are no known limitations or restrictions.

Caveats describe unexpected behavior or defects in the 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 Cisco IOS Release 12.4(11)T are also in Cisco IOS Release 12.4(11)XJ. For information on 
caveats in Cisco IOS Release 12.4(11)T, refer to the 

document. This document lists severity 1 and 2 caveats; the documents are located on 

Documentation CD.

If you have an account with 

, you can also use the Bug Toolkit to find select caveats of any 

severity. To reach the Bug Toolkit, log in to 

 and click Service & Support: Technical 

Assistance Center: Tool Index: Bug Toolkit. Another option is to go to