Cisco AS5350XM Software Configuration Guide - Page 178

Information About Voice Enhancement Features for Cisco IOS Release 12.4(24)T Voice Enhancement Features for Cisco IOS Release 12.4(24)T For more information about modem pass-through, refer to the "Configuring Modem Passthrough" chapter in the Cisco IOS Fax, Modem, and Text Support over IP Configuration Guide. Voice Port Bit Conditioning To customize signaling parameters for a particular E1 or T1 channel group on a channelized line, use the cas-custom command in controller configuration mode. To disable the signaling customization, use the no form of this command. You can configure the system to deviate from a country's default settings as defined by Cisco. To do this, choose invert-abcd as an optional keyword: cas-custom channel {define | ignore | invert-abcd} The invert-abcd keyword inverts the ABCD bits before TX and after RX. This feature is disabled by default, which is the ITU default. Voice Trunk Conditioning and Trunk Conditioning OOS The voice trunk conditioning feature enables you to create a voice class, configure specific signaling attributes to the voice class, and then map the attributes in the voice class to either a Voice over Frame Relay, Voice over ATM, or a Voice over HDLC dial peer. Using the voice class, you can define the keepalive-signaling packet interval and the signal pattern (ABCD) bit pattern for Cisco-trunk (private-line) calls. Trunk-conditioning signaling attributes apply to permanent point-to-point voice connections (private lines and tie lines) that you create using the connection trunk command. Trunk conditioning enables control over Cisco private-line calls that are sent over Frame Relay or ATM networks. When private-line or tie-line calls are sent between two PBXs, fault indications are sent to the sending PBX. If the call fails, the PBX can select an alternate path to route the calls. Selecting an alternate path applies to analog connections or digital T1/E1 using channel-associated signaling (CAS) ABCD signaling. It does not apply to common-channel signaling (CCS). When T1/E1 CAS is carried in transparent pass-through mode for arbitrary, unknown, or unsupported CAS protocols, you must define on-hook or idle patterns so that the digital signal processor (DSP) code can sense the idle call state and shut off the flow of voice packets when no active call is in progress. This mode provides an additional idle bandwidth-saving mechanism for those cases when voice activity detection (VAD) is not desired. For more information about this feature, refer to the Trunk Management Features document. Note An out-of-service (OOS) condition can be signaled using an ABCD bit pattern that is different from the busy or seized state. The difference enables the PBX to distinguish between OOS and congestion. For more information, refer to the Trunk Management Features document. Enhanced Multifrequency Signaling for Feature Group D (E911) The Enhanced Multifrequency for Feature Group D and Analog CAMA Trunks feature enhances the 911 interconnect capabilities of Cisco IOS-based gateways. This document describes E911 support requirements, which include support for Enhanced Multifrequency signaling for Feature Group D and 190 Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide