Manual

PSTN Fallback Enhancement
Supported Standards, MIBs, and RFCs
4
Cisco IOS Release 12.2(2)XA
Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. As
of May 2001, Feature Navigator supports M, T, E, S, and ST releases. You can access Feature Navigator
at the following URL:
http://www.cisco.com/go/fn
Supported Standards, MIBs, and RFCs
Standards
No new or modified standards are supported by this feature.
MIBs
No new or modified MIBs are supported by this feature.
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules,
go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
No new or modified RFCs are supported by this feature.
Prerequisites
Before you can configure the PSTN fallback enhancement, you must have already configured PSTN
fallback and VoIP. For more information, see the “Configuring Trunk Connections and Conditioning
Features” chapter in the Cisco IOS Voice, Video, and Fax Configuration Guide and the Cisco IOS Voice,
Video, and Fax Command Reference.
Configuration Tasks
See the following sections for configuration tasks for the PSTN Fallback enhancement feature. Each task
in the list is identified as either required or optional.
• Configuring the PSTN Cause Code, page 5 (required)
• Verifying PSTN Fallback Configuration, page 5 (optional)