DIAL-CONTROL-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsDIAL-CONTROL-MIB

Organization: IETF ISDN Working Group

Last Updated: 1996-09-23

Category: Telephony and VoIP

Description: Defines managed objects for managing demand access circuits including ISDN, covering peer configuration, active call monitoring, and call history tracking.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring DIAL-CONTROL-MIB with a free 30-day trial of IPNetwork Monitor.

What Is DIAL-CONTROL-MIB?

DIAL-CONTROL-MIB is a vendor-neutral IETF standards MIB (RFC 2128) for managing demand-access dial circuits such as ISDN, modem, and other on-demand WAN links, covering peer configuration, active call state, and call history. It exposes configuration data for each dial peer -- accept mode, originate/answer addresses, sub-address, closed user group, and link speed -- as well as global controls like trap enablement for the dial-control subsystem. Administrators use it to monitor the operational status of demand-access links: whether a peer is configured to dial or answer correctly, what addresses and speeds are negotiated, and (via associated call-active/call-history objects) whether calls are succeeding, failing, or flapping, which is central to diagnosing intermittent WAN backup or ISDN dial-on-demand connectivity. It is explicitly designed to work alongside the standard ifTable (RFC 1573/MIB-II) for each dial interface's underlying interface entry, and layers on top of whatever physical dial technology (ISDN BRI/PRI, modem) is in use. It is deployed on routers and access servers using dial-on-demand or ISDN backup circuits in legacy WAN environments, and any network management platform that supports the DIAL-CONTROL-MIB MIB can poll these objects to confirm dial peer and call status without vendor-specific extensions.

IPNetwork Monitor allows you to monitor SNMP objects defined in DIAL-CONTROL-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

  • vendor-neutral, standards-based MIB, not tied to a specific manufacturer
  • routers and access servers with ISDN/dial-on-demand WAN interfaces

Monitoring Examples

An admin can poll dialCtlPeerCfgTable/dialCtlPeerCfgEntry to check a given dialCtlPeerCfgId's dialCtlPeerCfgOriginateAddress and dialCtlPeerCfgAnswerAddress, confirming a dial peer is configured with the correct number for ISDN dial-on-demand backup. dialCtlPeerCfgSpeed and dialCtlPeerCfgIfType reveal the negotiated link type and speed, useful for diagnosing why a backup circuit isn't reaching expected throughput. dialCtlTrapEnable controls whether call state-change traps fire, letting an operator get proactively notified when a backup dial link activates or drops.

What Can Be Monitored

  • dial peer configuration (originate/answer address)
  • dial peer link speed and interface type
  • dial control trap/notification enablement
  • closed user group settings
  • call accept mode
Imported Objects

From IANAifType-MIB

IANAifType

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero
ifIndexOBJECT-TYPE
ifOperStatusOBJECT-TYPE

From RFC1213-MIB

transmission

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
TimeStamp
OIDs

FAQ

How is DIAL-CONTROL-MIB used to monitor an ISDN dial-on-demand backup link?
It exposes per-peer configuration such as accept mode, originate/answer addresses, sub-address, and link speed, letting an admin confirm a dial peer is set up to dial or answer correctly, and via associated call-active/call-history data, see whether calls are succeeding, failing, or flapping.

What role does DIAL-CONTROL-MIB play alongside the standard interfaces MIB when troubleshooting a WAN backup circuit?
It layers on top of ifTable from MIB-II/RFC 1573, adding dial-specific peer configuration and call-control data - like closed user group settings and dial control trap enablement - not present in the generic interface table, giving a fuller picture of a demand-access link's health.

RFC description

IETF standard MIB (RFC 2128) for managing dial-up connections including modems and ISDN interfaces.

Start monitoring Router/access server with ISDN/dial-on-demand WAN interface (vendor-neutral, RFC 2128) 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.

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