SIP-UA-MIB

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Organization: IETF Session Initiation Protocol Working Group

Last Updated: 2007-04-20

Category: Telephony and VoIP

Description: Defines managed objects for monitoring and managing SIP User Agent entities, including configuration of SIP server addresses.

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

What Is SIP-UA-MIB?

SIP-UA-MIB is a vendor-neutral IETF standards-based MIB (RFC 3261 era) defining managed objects for SIP User Agent entities -- endpoints that combine a User Agent Client (which initiates SIP requests) and a User Agent Server (which responds to them). It exposes configuration data for the SIP servers a user agent is registered to or routes through, including server address, address type, and the server's role (e.g. outbound proxy, registrar). Its monitoring focus is primarily configuration/software status: it lets an administrator verify which SIP server(s) a given user agent is configured to use and in what role, which is essential for diagnosing call setup failures caused by a misconfigured or unreachable SIP server address. It is directly dependent on the SIP protocol standard (RFC 3261) for its semantics and is a vendor-neutral companion to other SIP-related IETF MIBs such as SIP-REGISTRAR-MIB. It is typically deployed on SIP-capable endpoints, softphones, or gateways in VoIP networks where operators need visibility into per-agent SIP server configuration. Engineers configuring or troubleshooting a Cisco IOS SIP User Agent (the 'show sip-ua' command family) reference this standard IETF MIB to monitor SIP UA registration and session status via SNMP.

IPNetwork Monitor allows you to monitor SNMP objects defined in SIP-UA-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
SIP user agent, softphone, or VoIP gateway

Monitoring Examples

The sipUACfgServerTable (with entries sipUACfgServerEntry) is indexed by sipUACfgServerIndex and exposes sipUACfgServerAddressType, sipUACfgServerAddress, and sipUACfgServerRole for each configured SIP server on a user agent. An administrator troubleshooting failed call setups on a SIP endpoint could poll this table to confirm the configured server address matches the expected registrar or proxy, and check sipUACfgServerRole to verify the agent is pointed at the correct server type (e.g. registrar vs. outbound proxy) rather than a stale or incorrect address.

What Can Be Monitored

configured SIP server address
SIP server address type
SIP server role (registrar/proxy)
number of configured SIP servers

Imported Objects

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From NETWORK-SERVICES-MIB

applIndex

OBJECT-TYPE

From SIP-TC-MIB

SipTCEntityRole

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
Unsigned32
mib-2

OIDs

OID symbolic	OID numeric	Type	Access	Description
sipUAMIB	1.3.6.1.2.1.150			Session Initiation Protocol (SIP) User Agent (UA) MIB module. SIP is an application-layer signaling protocol for creating, modifying, and terminating multimedia sessions with one or more participants. These sessions include Internet multimedia conferences and Internet telephone calls. SIP is defined in RFC 3261 (June 2002). A User Agent is an application that contains both a User Agent Client (UAC) and a User Agent Server (UAS). A UAC is an application that initiates a SIP request. A UAS is an application that contacts the user when a SIP request is received and that returns a response on behalf of the user. The response accepts, rejects, or redirects the request. Copyright (C) The IETF Trust (2007). This version of this MIB module is part of RFC 4780; see the RFC itself for full legal notices.
sipUAMIBObjects	1.3.6.1.2.1.150.1
sipUACfgServer	1.3.6.1.2.1.150.1.1
sipUACfgServerTable	1.3.6.1.2.1.150.1.1.1		not-accessible	This table contains SIP server configuration objects applicable to each SIP user agent in this system.
sipUACfgServerEntry	1.3.6.1.2.1.150.1.1.1.1		not-accessible	A row of server configuration. Each row represents those objects for a particular SIP user agent present in this system. applIndex is used to uniquely identify these instances of SIP user agents and correlate them through the common framework of the NETWORK-SERVICES-MIB (RFC 2788). The same value of applIndex used in the corresponding SIP-COMMON-MIB is used here.
U32 sipUACfgServerIndex	1.3.6.1.2.1.150.1.1.1.1.1	Unsigned32	not-accessible	A unique identifier of a server address when multiple addresses are configured by the SIP entity. If one address isn't reachable, then another can be tried.
IPt sipUACfgServerAddressType	1.3.6.1.2.1.150.1.1.1.1.2	InetAddressType	read-only	This object reflects the type of address contained in the associated instance of sipUACfgServerAddress.
IP sipUACfgServerAddress	1.3.6.1.2.1.150.1.1.1.1.3	InetAddress	read-only	This object reflects the address of a SIP server this user agent will use to proxy/redirect calls. The type of this address is determined by the value of the sipUACfgServerAddressType object.
SIP sipUACfgServerRole	1.3.6.1.2.1.150.1.1.1.1.4	SipTCEntityRole	read-only	This object reflects the function of the SIP server this user agent should communicate with: registrar, proxy (outbound proxy), etc.
sipUAMIBConformance	1.3.6.1.2.1.150.2
sipUAMIBCompliances	1.3.6.1.2.1.150.2.1
sipUACompliance	1.3.6.1.2.1.150.2.1.1			The compliance statement for SIP entities that implement the SIP-UA-MIB module.
sipUAMIBGroups	1.3.6.1.2.1.150.2.2
sipUAConfigGroup	1.3.6.1.2.1.150.2.2.1			A collection of objects providing information about the configuration of SIP User Agents.

RFC description

MIB for managing SIP (Session Initiation Protocol) User Agent endpoints, provides monitoring of SIP calls, registration status, and protocol statistics.

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Download SIP-UA-MIB

What Is SIP-UA-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description