Congestion - Policer - Preference

During adaptive throttling, the SBC can assign different preferences (priorities) to normal calls, emergency calls, initial SIP registrations and initial SIP subscriptions. This is configured by the policer preference values assigned to each request type.

There are four types of traffic that can be assigned to a preference:

• Call: Preference value applied during normal call admission.
• Emergency Call: Preference value that is applied during emergency call admission
• Initial Sip Register: Preference value that is applied during initial SIP registration admission.
• Initial Sip Subscribe: Preference value to apply to initial SIP Subscribe requests during initial SIP Subscribe admission.

The value of the preference can be 0 to 3 where 0 is the highest preference and 3 being the lowest preference. By default, emergency calls have the highest preference (0). During adaptive overload control, some messages of a less preferred type of traffic may be rejected in favor of a more preferred type of traffic.

On SBC main screen, go to All > System > Congestion > Policer > Preference.

The Preference window is displayed:

Figure 1: System - Congestion - Policer - Preference

The following fields are displayed:

Table 1: System - Congestion  Policer - Preference parameters

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