SCCP

The SCCP object is a child of the Call Agent object.

The SCCP object contains all of the configuration that is used to allow the TCAP applications to exchange information. The SCCP object contains a pointer to the Remote Concerned Area. There is only a single SCCP object, which is created before delivery of MetaSwitch VP3500 and which you cannot destroy.

Actions
Create Enable Activate
Delete Disable Deactivate
Apply Reset Statistics Refresh

Parameter

Access

Description
SCCP name Change The name of the SCCP family.
Initial SST message timer Change This is the initial value of the SST Message Timer. This timer is started when VP3500 first sends a subsystem-status test (SST) message to a remote SP. If the timer pops before a response is received, VP3500 starts the timer again using the larger value Maximum SST message timer. This use of two timers allows VP3500 to send out a couple of test messages quickly, and then move to a more occasional test message. VP3500 sends a SST periodically to a remote subsystem if it is reported as inactive, until it is reported as active. It is reported as active by a subsystem-available (SSA) message. Range: 5 - 10. The default is 8.
Maximum SST message timer Change Maximum value of the SST Message Timer. This timer is run after an initial subsystem status test times out. It is longer than the initial timer. Range: 600 - 1200. The default is 600.
Initial SCLC reassembly timer Change Initial value of the SCLC reassembly timer. VP3500 starts this timer when it begins a reassembly, and stops it when the reassembly ends. If the timer expires and the reassembly is not complete, VP3500 cancels the reassembly and discards the partial message. VP3500 also uses this timer for segmentations, and cancels any segmentation if it is not able to acquire a buffer in this period. Range: 10 - 20. The default is 10.
SCLC SSN congestion timer Change Initial value of the SCLC SSN congestion timer. If a local application is congested for this period of time, then SCCP removes the application from service until the congestion clears. Range: 1000 - 5000. The default is 2000.
Segmentation in octets - lower limit Change Lower limit for segmentation in octets. If the length of user data is less than this, then VP3500 does not attempt to segment the message. This value must not be greater than Segmentation in octets - upper limit. Do not change this valuer without a good knowledge of the SS7 network. Setting a value that is too high will cause MTP3 to discard messages, while setting a value that is too low can cause excessive segmentation, leading to increased network load. Range: 160 - 254. The default is 170.
Segmentation in octets - upper limit Change Upper limit for segmentation in octets. If the length of user data is greater than this, then VP3500 segments the message. If the length is less than this but not less than Segmentation in octets - lower limit, then VP3500 may segment the message. This value must not be less than Segmentation in octets - lower limit. Be careful when changing this value. Setting a value which does not match the specifics of the SS7 network could cause messages to be lost, or network load to be increased. Range: 160 - 254. The default is 220.
Maximum user data size accepted from TCAP Read only The maximum user data size which VP3500 will accept from TCAP. This value is not configurable. Value: 3952 bytes.
Maximum single message data length support for MTP3 Read only The maximum data length which DC-MTP3 supports on a single message. The default is 272.
Deactivation mode Change Specifies how child objects should be deactivated when deactivating this object. Values:
  • Normal (default)
    Shut down child objects normally before deactivating the object.
  • Quiesce
    Wait for existing child objects to become inactive before deactivating the object, but do not allow any new child objects to be activated.
  • Abort
    Deactivate the object and all its child objects immediately. (This may result in errors at remote systems.)
Alarm state Read only Specifies whether any alarms are currently raised for this object. Values:
  • Clear
    No alarms are currently raised.
  • Attention Required
    Attention Required - the object is not operating normally, and needs operator intervention.
  • Attend To Dependent
    Attention Required elsewhere - another object on which this object depends is not operating normally.
Alarm log correlator - Attention Required Read only Identifier of the log message for the event that caused the last Attention Required alarm state for this object. This field is reset when Attention Required alarm events is reset to zero.
Attention Required alarm events Read only / Reset Number of times (since the alarm count was reset) that this object's alarm state has gone to Attention Required.
Alarm log correlator - Attend To Dependent Read only Identifier of the log message for the event that caused the last Attend To Dependent alarm state for this object. This field is reset when the Attend To Dependent alarm events field is reset to zero.
Attend To Dependent alarm events Read only / Reset Number of times (since this field was reset) that this object's alarm state has gone to Attend To Dependent.
Alarm state changed timestamp Read only The time (UTC) at which the Alarm state last changed.
Alarm events reset timestamp Read only The time (UTC) at which the Attention Required alarm events was last reset to zero.
Child Attention Required alarms Read only The total number of child objects of this object that are in Attention Required state.
Child Attention Required alarm events Read only / Reset The total number of Attention Required alarms for this object.
Child Attend To Dependent alarms Read only The total number of children of this object that are in Attend To Dependent state.
Child Attend To Dependent alarm events Read only / Reset The total number of Attend To Dependent alarms for all children of this object.
Requested status Read only Specifies whether an administrator has attempted to activate the SCCP. Values:
  • Active
    The object has been activated.
  • Inactive
    The object has not been activated or has been deactivated.
  • Disabled
    The object has been disabled.
Actual status Read only Specifies the current status of the SCCP. Values:
  • Active
    The object is active.
  • Going Active
    Activation is in progress.
  • Going Inactive
    Deactivation is in progress.
  • Inactive
    The object is inactive.
  • Disabled
    The object has been disabled.
  • Activation Failed
    The object is inactive because an activation attempt has failed.
  • Failed
    The object was active but has failed.
  • Quiescing
    The object is preparing for normal deactivation. It is operating normally but will not accept any new users.
  • Waiting For Parent
    The object cannot be used because its parent object is not yet active.
  • Parent Failed
    The object cannot be used because its parent object has failed.