CXCAS-MIB

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Category: SNA and Legacy Protocols, Telephony and VoIP, Vendor: Aastra

Description: Configures Aastra's Channel Associated Signaling (CAS) settings for analog telephony and trunk interfaces.

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What Is CXCAS-MIB?

CXCAS-MIB is an Aastra vendor-specific MIB, registered under the CXProduct-SMI cxCAS branch, for configuring Channel Associated Signaling (CAS) on T1/E1 analog telephony and trunk interfaces on Aastra CX-series voice gateway equipment. It exposes dsx1ExtAbcdTxSignalingTable, indexed by emulated interface type (E&M, FXS, FXO), with per-state ABCD bit-pattern configuration objects covering on-hook/off-hook (dsx1ExtAbcdEmOnHook/OffHook), seizure and clear-forward/backward states for R2 signaling, and FXS/FXO loop and ringing states (dsx1ExtAbcdFxLo, dsx1ExtAbcdFxLc, dsx1ExtAbcdFxRingingOn/Off), plus dsx1ExtAbcdRxSignalingTable that maps a received ABCD bit pattern back to a named signaling state (on-hook, off-hook, ring-on, answer, busy-out, faulty-link, and others) via dsx1ExtAbcdValue. This is a configuration/mapping MIB rather than a counter MIB, so monitoring it reveals whether the CAS bit-pattern mappings match the expected signaling protocol for a given trunk, which matters for correct call setup/teardown over TDM trunks. It depends on RFC-1212 for its OBJECT-TYPE macro since it predates SNMPv2, and on the broader CXProduct-SMI enterprise tree, and it is deployed on Aastra CX-series gateways carrying analog or R2 CAS trunk traffic, as documented in this CXCAS-MIB MIB Browser reference to its ABCD signaling tables.

IPNetwork Monitor allows you to monitor SNMP objects defined in CXCAS-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

Aastra CX-series voice gateways (T1/E1 CAS trunk interfaces)

Monitoring Examples

An operator reviews dsx1ExtAbcdRxSignalingTable for a given interface type to confirm each configured ABCD value maps to the expected dsx1ExtAbcdValue (e.g., 'answer' or 'busy-out'); a mismatched mapping, such as an incoming seizure pattern resolving to 'faulty-link' instead of 'seize', would explain calls failing to connect or being dropped as faulty on that trunk.

What Can Be Monitored

ABCD transmit signaling bit patterns per interface type
ABCD receive signaling bit-pattern-to-state mapping
on-hook/off-hook/seizure/clear-forward states
FXS/FXO loop and ringing states
busy-out and faulty-link signaling values

Imported Objects

From CXProduct-SMI

cxCAS

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

OIDs

OID symbolic	OID numeric	Type	Access	Description
dsx1ExtAbcdTxSignalingTable	1.3.6.1.4.1.495.2.1.6.59.10		not-accessible	ABCD bits pattern table for T1/E1 transmit signaling protocols
dsx1ExtAbcdTxSignalingEntry	1.3.6.1.4.1.495.2.1.6.59.10.1		not-accessible	ABCD transmit signaling bits row definition.
INT dsx1ExtAbcdTxSignalingTypeIndex	1.3.6.1.4.1.495.2.1.6.59.10.1.1	INTEGER	read-only	The index of the emulated interface type: 1=E&M, 2=FXS, 3=FXO
INT dsx1ExtAbcdEmOnHook	1.3.6.1.4.1.495.2.1.6.59.10.1.10	INTEGER	read-write	ABCD bits pattern to signal the 'on-hook' state of an emulated E&M interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdEmOffHook	1.3.6.1.4.1.495.2.1.6.59.10.1.11	INTEGER	read-write	ABCD bits pattern to signal the 'off-hook' state of an emulated E&M interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdEmSeizeAck	1.3.6.1.4.1.495.2.1.6.59.10.1.12	INTEGER	read-write	ABCD bits pattern to signal the 'seizure acknowledge' state of an emulated R2 signaling line.
INT dsx1ExtAbcdEmClearForward	1.3.6.1.4.1.495.2.1.6.59.10.1.13	INTEGER	read-write	ABCD bits pattern to signal the 'clear forward' state of an emulated R2 signaling line.
INT dsx1ExtAbcdEmClearBackward	1.3.6.1.4.1.495.2.1.6.59.10.1.14	INTEGER	read-write	ABCD bits pattern to signal the 'clear backward' state of an emulated R2 signaling line.
INT dsx1ExtAbcdFxLo	1.3.6.1.4.1.495.2.1.6.59.10.1.15	INTEGER	read-write	ABCD bits pattern to signal the 'loop open' state of an emulated FXS or FXO interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdFxLc	1.3.6.1.4.1.495.2.1.6.59.10.1.16	INTEGER	read-write	ABCD bits pattern to signal the 'loop closed' state of an emulated FXS or FXO interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdFxRingingOn	1.3.6.1.4.1.495.2.1.6.59.10.1.17	INTEGER	read-write	ABCD bits pattern to signal the 'ringing' state of an emulated FXS or FXO interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdFxLcf	1.3.6.1.4.1.495.2.1.6.59.10.1.18	INTEGER	read-write	ABCD bits pattern to signal the 'loop current feed' state of an emulated FXS or FXO interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdFxLcfo	1.3.6.1.4.1.495.2.1.6.59.10.1.19	INTEGER	read-write	ABCD bits pattern to signal the 'loop current feed open' state of an emulated FXS or FXO interface type. Range of Values: 0 to 15
INT dsx1ExtAbcdFxRingingOff	1.3.6.1.4.1.495.2.1.6.59.10.1.20	INTEGER	read-write	ABCD bits pattern to signal the 'ringing off' state of an emulated FXO interface type, only if E1 CAS is used. Range of Values: 0 to 15
INT dsx1ExtAbcdAnswer	1.3.6.1.4.1.495.2.1.6.59.10.1.21	INTEGER	read-write	ABCD bits pattern to signal the 'answer' state of an emulated interface type (FXS, FXO or E&M), only if E1 CAS is used. Range of Values: 0 to 15
INT dsx1ExtAbcdBusyOut	1.3.6.1.4.1.495.2.1.6.59.10.1.22	INTEGER	read-write	ABCD bits pattern to signal a disabled channel. Range of Values: 0 to 15
INT dsx1ExtAbcdFaultyLink	1.3.6.1.4.1.495.2.1.6.59.10.1.23	INTEGER	read-write	ABCD bits pattern to signal a faulty link (line). Range of Values: 0 to 15
dsx1ExtAbcdRxSignalingTable	1.3.6.1.4.1.495.2.1.6.59.20		not-accessible	ABCD bits pattern table for T1/E1 receive signaling protocols
dsx1ExtAbcdRxSignalingEntry	1.3.6.1.4.1.495.2.1.6.59.20.1		not-accessible	ABCD receive signaling bits row definition.
INT dsx1ExtAbcdRxSignalingTypeIndex	1.3.6.1.4.1.495.2.1.6.59.20.1.1	INTEGER	read-only	The index of the emulated interface type: 1=E&M, 2=FXS, 3=FXO
INT dsx1ExtAbcdRxSignalingAbcdValue	1.3.6.1.4.1.495.2.1.6.59.20.1.2	INTEGER	read-only	The index for all four ABCD bits patterns.
INT dsx1ExtAbcdValue	1.3.6.1.4.1.495.2.1.6.59.20.1.10	INTEGER	read-write	Signaling value assigned to selected ABCD bits pattern. Range of Values: 1 to 11

RFC description

Manages Aastra CAS (Channel Associated Signaling) configuration for analog telephony and trunk interfaces.

Start monitoring Aastra CX-series voice gateway (T1/E1 CAS trunk) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CXCAS-MIB

What Is CXCAS-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description