CISCO-VOICE-CAS-MODULE-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2004-03-15

Category: Telephony and VoIP, Vendor: Cisco Devices

Description: Manages Cisco CAS (Channel Associated Signaling) voice modules for T1/E1 trunk connectivity.

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What Is CISCO-VOICE-CAS-MODULE-MIB?

This MIB configures Channel Associated Signaling (CAS) bit patterns on Cisco voice interface modules, controlling how ABCD signaling bits, representing off-hook, on-hook, idle, and flash events, are translated between the TDM (T1/E1) side and packet side of a voice gateway. It is a configuration-focused MIB for programming per-timeslot signaling bit templates rather than a hardware-sensor MIB. Its monitoring relevance is software/configuration status, as administrators verify that the correct ABCD bit action templates are applied per module and timeslot pattern, since a mismatched CAS template can cause call signaling failures such as failure to detect on-hook/off-hook transitions. It is specific to Cisco voice gateway/DSP modules and works alongside other Cisco voice MIBs, such as the VISM module MIBs, in TDM-to-VoIP gateway deployments. It is deployed on Cisco voice gateway platforms carrying T1/E1 CAS trunks requiring custom signaling bit translation, and the CISCO-VOICE-CAS-MODULE-MIB download is available for administrators to load into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-VOICE-CAS-MODULE-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco voice gateway modules supporting T1/E1 CAS trunks

Monitoring Examples

An administrator diagnosing a stuck or misdetected call state would inspect cvcmABCDBitTemplateConfigTable / cvcmABCDBitTemplateConfigEntry for a given cvcmModuleIndex and cvcmCasTemplateIndex, checking cvcmABCDIncomingPattern and cvcmABCDOutgoingPattern against the expected signaling convention for the connected PBX or carrier. Incorrect cvcmCasABitAction/cvcmCasBBitAction/cvcmCasCBitAction settings could explain why the module isn't correctly signaling an on-hook or flash-hook event. The cvcmCasTemplateName helps identify which named template is active on a given module.

What Can Be Monitored

ABCD signaling bit pattern configuration
CAS template assignment per module
incoming/outgoing bit pattern translation
per-bit signaling action configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From CISCO-TC

EntPhysicalIndexOrZero

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoVoiceCasModuleMIB	1.3.6.1.4.1.9.9.389			This MIB is used to support Programmable CAS signaling Bit configuration on modules that support voice traffic. This MIB will enable programming of the CAS bits in order to translate incoming/outgoing bit patterns from/to the TDM or packet side interface. Terminology: ABCD - Signaling bits describing off-hook, on-hook, idle, flash, etc events. DSP - Digital Signal Processing CAS - Channal Associated Signaling E&M - Ear and Mouth Protocol TDM - Time Division Multiplexed
ciscoVoiceCasModuleNotifs	1.3.6.1.4.1.9.9.389.0
ciscoVoiceCasModuleObjects	1.3.6.1.4.1.9.9.389.1
cvcmCasConfig	1.3.6.1.4.1.9.9.389.1.1
cvcmABCDBitTemplateConfigTable	1.3.6.1.4.1.9.9.389.1.1.1		not-accessible	This table is used to configure templates on the module/card. These templates provide mapping information between the incoming CAS ABCD signaling bit patterns and the outgoing ABCD signaling bit patterns. The outgoing bit patterns are derived from the incoming bit patterns by applying a set of actions to each incoming bit. Thus, this table essentially contains configuration information about CAS ABCD signaling bits. The ABCD bit carries signaling information describing off-hook, on-hook event etc on a T1 or E1. The pattern representations differ in CAS variants on a T1 and E1. For example: On T1: E&M protocol ABCD seized is 1100 On E1: CAS-R2 signaling ABCD seized is 0001 This table is configured on a per module/ card basis. Further, one can have multiple different actions performed on the different bits (A, B, C or D) consecutively for the same incoming ABCD bit index. However, a given bit position can only have one action being performed on it for a given incoming bit pattern. For example, for a given incoming bit index, one can define the 'A' bit to be set to 0, the 'B' bit to be swapped with the 'C' bit, the 'C' bit to be swapped with the 'B' bit and the 'D' bit to be inverted. Thus, using this table, the user can create a template with name (cvcmCasTemplateName) 'Template1' where for incoming pattern (cvcmABCDIncomingPattern) '0000', the action on the A bit (cvcmCasABitAction) is 'casBitSetToZero', the action on the B bit (cvcmCasBBitAction) is 'casBitCBit', the action on the C bit (cvcmCasCBitAction) is 'casBitBBit' and the action on the D bit (cvcmCasDBitAction) is 'casBitInvertBit'. This will create one entry in 'Template1' where the resultant outgoing pattern (cvcmABCDOutgoingPattern) will be '0001'.
cvcmABCDBitTemplateConfigEntry	1.3.6.1.4.1.9.9.389.1.1.1.1		not-accessible	An entry in the table. Each entry consists of user defined CAS ABCD bit information to configure a transmit or received signaling channel on a DSP.
U32 cvcmModuleIndex	1.3.6.1.4.1.9.9.389.1.1.1.1.1	Unsigned32	not-accessible	This object uniquely identifies the card/ module where this table resides. It could be the slot number of the module or be 1 where 'module' is not applicable.
U32 cvcmCasTemplateIndex	1.3.6.1.4.1.9.9.389.1.1.1.1.2	Unsigned32	not-accessible	This object will index into the template that is configured in this table.
U32 cvcmABCDPatternIndex	1.3.6.1.4.1.9.9.389.1.1.1.1.3	Unsigned32	not-accessible	Will be used to index into a particular pattern mapping in the template that is configured. Since there are only 4 signaling bits (A, B, C, D), there can only be (2^4) or 16 patterns per template.
ENT cvcmModulePhysicalIndex	1.3.6.1.4.1.9.9.389.1.1.1.1.4	EntPhysicalIndexOrZero	read-only	This object represents the entPhysicalIndex of the module where this table is being configured. If the entPhysicalTable is not supported on the SNMP agent, then the value of this object will be zero.
STR cvcmCasTemplateName	1.3.6.1.4.1.9.9.389.1.1.1.1.5	SnmpAdminString	read-create	This object identifies the name of the template configured. This object needs to be unique among all the instances of the cvcmABCDBitTemplateConfigTable. The SNMP agent will need to validate this value for uniqueness.
CVC cvcmABCDIncomingPattern	1.3.6.1.4.1.9.9.389.1.1.1.1.6	CvcmCasPatternBitPosition	read-create	This object identifies the ABCD signaling bits that are received by the module. The actions specified in 'cvcmCasABitAction', 'cvcmCasBBitAction', 'cvcmCasCBitAction' and 'cvcmCasDBitAction' are applied to this object.
CVC cvcmABCDOutgoingPattern	1.3.6.1.4.1.9.9.389.1.1.1.1.7	CvcmCasPatternBitPosition	read-only	This object identifies the ABCD signaling bits defined by user, and downloaded to DSP signaling channel. This pattern is derived from the actions specified in 'cvcmCasABitAction', 'cvcmCasBBitAction', 'cvcmCasCBitAction' and 'cvcmCasDBitAction'. The same pattern can map to different cvcmABCDIncomingPattern depending on the set of actions. This pattern is mapped to input ABCD bit pattern received and reported to the TDM or network side.
CVC cvcmCasABitAction	1.3.6.1.4.1.9.9.389.1.1.1.1.8	CvcmCasBitAction	read-create	This object identifies the action on the 'A' bit of the incoming ABCD bit pattern specified in cvcmABCDIncomingPattern. For this object, 'cvcmInvertBit' is same as 'cvcmInvertABit', 'cvcmNoAction' is same as 'cvcmABit'.
CVC cvcmCasBBitAction	1.3.6.1.4.1.9.9.389.1.1.1.1.9	CvcmCasBitAction	read-create	This object identifies the action on the 'B' bit of the incoming ABCD bit pattern specified in cvcmABCDIncomingPattern. For this object, 'cvcmInvertBit' is same as 'cvcmInvertBBit', 'cvcmNoAction' is same as 'cvcmBBit'.
CVC cvcmCasCBitAction	1.3.6.1.4.1.9.9.389.1.1.1.1.10	CvcmCasBitAction	read-create	This object identifies the action on the 'C' bit of the incoming ABCD bit pattern specified in cvcmABCDIncomingPattern. For this object, 'cvcmInvertBit' is same as 'cvcmInvertCBit', 'cvcmNoAction' is same as 'cvcmCBit'.
CVC cvcmCasDBitAction	1.3.6.1.4.1.9.9.389.1.1.1.1.11	CvcmCasBitAction	read-create	This object identifies the action on the 'D' bit of the incoming ABCD bit pattern specified in cvcmABCDIncomingPattern. For this object, 'cvcmInvertBit' is same as 'cvcmInvertDBit', 'cvcmNoAction' is same as 'cvcmDBit'.
ROW cvcmCasBitRowStatus	1.3.6.1.4.1.9.9.389.1.1.1.1.12	RowStatus	read-create	An entry may be created using the 'createAndGo' option. When the row is successfully created, the object will be set to 'active' by the agent. An entry may be deleted by setting the object to 'destroy'.
cvcmMIBConformance	1.3.6.1.4.1.9.9.389.2
cvcmMIBGroups	1.3.6.1.4.1.9.9.389.2.1
cvcmCasBitGroup	1.3.6.1.4.1.9.9.389.2.1.1			A collection of objects used for configuring DSP signaling channel.
cvcmMIBCompliances	1.3.6.1.4.1.9.9.389.2.2
ciscoVoiceCasModuleMIBCompliance	1.3.6.1.4.1.9.9.389.2.2.1			Compliance statement for CISCO-VOICE-CAS-MODULE-MIB.

RFC description

Manages programmable CAS signaling bit translation on Cisco voice gateway modules for TDM/packet interface mapping.

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Download CISCO-VOICE-CAS-MODULE-MIB

What Is CISCO-VOICE-CAS-MODULE-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description