Use this object to specify the parameters governing the behavior when under local overload or when receiving congestion indications from downstream peers.

To View and Edit Congestion Handling

On SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > Sip Trunk Group > Sip Trunk Advanced > Congestion Handling. The Congestion Handling window is displayed.

The Congestion Handling can be checked for each Address Context, for each Zone, for each Sip Trunk Group created or for all the Address Contexts, Zones and Sip Trunk Groups created. Use the drop-down box to select the desired Address Context, Zone and Sip Trunk Group.

The Edit Congestion Handling window is displayed.

Sip Trunk Advanced - Congestion Handling Edit Window

The following fields are displayed:

Sip Trunk Advanced - Congestion Handling Parameters

Parameter

Description

Egress Throttling

Determines whether the received peer overload indications (SIP 503 w/ Retry After) cause to adaptively throttle egress calls and registrations to that peer. Options are:

  • disabled (default) – The traffic rate allowed to this peer is unchanged when a 503 response is received from the peer.
  • enabled – Traffic rate allowed to this peer is decreased when a 503 response is received from the peer.

Retry After min

 Specifies the minimum Retry-After time (in seconds) when an ingress call or register is rejected with 503 due to local overload. The value ranges from 0 to 120 seconds and the default value is 10 seconds.

Retry After Max

Specifies the maximum Retry-After time (in seconds) when an ingress call or register is rejected with 503 due to local overload. The value ranges from 0 to 120 seconds and the default value is 30 seconds.

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

 

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