What are SS7 SGC notifications?

Notifications in the SS7 SGC stack alert the administrator about infrequent major events. Subsystems in the SS7 SGC stack emit notifications upon detecting an error condition or an event of high importance.

Management clients may use either Java JMX MBean or SNMP trap/notifications to receive notifications emitted by the SS7 SGC stack.

Below are descriptions of:

You can review the history of emitted notifications using commands exposed by the Command-Line Management Console, which is distributed with the SGC SS7 stack.

Tip
See also

Supported CLI Operations for Alarms and Event History

How are notifications different from alarms?

Notifications are very similar to Alarms in the SGC stack:

  • Notifications have attributes (general and notification type-specific attributes).

  • The SGC stack stores a history of emitted notifications.

Warning The difference is that notifications are emitted (sent) whenever a particular event occurs; and there is no notion of active notifications or a notification being cleared.

Generic notification attributes

Notification attributes represent information about events that result in a notification being emitted. Each notification type has the following generic attributes, plus a group of attributes specific to that notification type (described in the following sections).

Attribute Description

id

unique notification identifier

name

name of notification type

severity

notification severity:

  • CRITICAL — application encountered an error which prevents it from continuing (it can no longer provide services)

  • MAJOR — application encountered an event which significantly impacts delivered services; some services may no longer be available

  • MINOR — application reports an event which does not have significant impact on delivered services

  • INFO — application reports an information event which does not have any impact on delivered services

  • CLEARED — alarm has been cleared.

timestamp

timestamp when the event occurred

Notification types

This section describes all notification types that can be emitted by the SGC node:

MTP decode errors

Notification name mtpDecodeErrors (observed errors in incoming messages at the MTP layer) contains information about the number of badly formatted messages at the MTP layer and the number of messages directed to an unsupported MTP user. This notification is emitted periodically, with a summary of the number of errors in that period; it is not emitted if there are no errors.

Attribute Description Values of constants

id

unique notification identifier

name

name of notification type

mtpDecodeErrors

severity

notification severity

INFO

timestamp

timestamp when the event occurred

nodeId

affected node

connectionID

affected connection

decodeFailuresLastTime

number of message decode failures during report interval

unsupportedUserFailuresTime

number of messages with unsupported user part during report interval

SCCP decode errors

Notification name sccpDecodeErrors (observed errors in incoming messages at the SCCP layer) contains information about the number of badly formatted messages at the SCCP layer and the number of messages directed to a prohibited SSN. This notification is emitted periodically, with a summary of the number of errors in that period; it is not emitted if there are no errors.

Attribute Description Values of constants

id

unique notification identifier

name

name of notification type

sccpDecodeErrors

severity

notification severity

INFO

timestamp

timestamp when the event occurred

nodeId

affected node

decode-failures-last-time

number of message decode failures during report interval

ssn-failures-last-time

number of messages directed to prohibited SSN during report interval

TCAP decode errors

Notification name tcapDecodeErrors (observed errors in incoming messages at TCAPthe layer) contains information about number of badly formatted messages at the TCAP layer and number of messages that SGC is unable to forward to TCAP Stack (CGIN RA). This notification is emitted periodically, with a summary of the number of errors in that period; it is not emitted if there are no errors.

Attribute Description Values of constants

id

unique notification identifier

name

name of notification type

tcapDecodeErrors

severity

notification severity

INFO

timestamp

timestamp when the event occurred

nodeId

affected node

decode-failures-last-time

number of message decode failures during report interval

missing-peer-last-time

number of messages that SGC was unable to forward to the TCAP stack

TCAP stack register

Notification name tcapStackRegister (observed errors in incoming messages at the TCAP layer) is emitted whenever a TCAP stack registers in the SGC.

Attribute Description Values of constants

id

unique notification identifier

name

name of notification type

tcapStackRegister

severity

notification severity

INFO

timestamp

timestamp when the event occurred

ssn

registered SSN

nodeId

affected node

stackIP

IP address of the stack

prefix

allocated transaction prefix

TCAP stack unregister

Notification name tcapStackUnregister (observed errors in incoming messages at the TCAP layer) is emitted whenever a TCAP Stack deregisters in the SGC.

Attribute Description Values of constants

id

unique notification identifier

name

name of notification type

tcapStackUnregister

severity

notification severity

INFO

timestamp

timestamp when the event occurred

ssn

registered SSN

node-id

affected node

stack-ip

IP address of the stack

prefix

allocated transaction prefix
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