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Multi-Level Precedence and Preemption allows an authorized user the ability to specify a precedence level when making a call and preempt any existing calls that have a lower precedence level. Preemption allows important calls the ability to take precedence over less important calls. Precedence determines the level of importance of a call and makes the decision as to whether the call can be preempted or not. MLPP is supported between the ISDN protocol and the SIP protocol (ISDN to SIP, SIP to ISDN). Below is a table displaying the supported Precedence levels.
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The procedure below assumes the Basic Configurations topic has already been achieved and any objects configured in that topic will have already been configured.
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Right click on the SIP Profiles object and select New SIP Profile. The SIP Profile allows a user to configure attributes/features that will be used with the SIP Signaling, External SIP Gateway, and ENUM Server Set objects. The first SIP Profile object created is a default object and all the fields are shaded green indicating modifications can not be done to this profile. Create a second SIP profile object and the individual fields can now be modified. Modify each field as needed. For information on the individual fields, refer to the SIP Profile - SGP topic.
Right click on the second SIP Profile object created and select New SIP Headers. In the Resource Priority Header Support (MLPP) field select Enabled from the drop down menu.
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Right click on the Dialogic object and select New External Network Elements. The External Network Elements object is a container object and no configuration is needed here. For more information on this object refer to the External Network Elements topic.
Right click on External Network Elements and select New External Gateways. The External Gateways object is a container object and no configuration is needed here. For more information on this object refer to the External Gateways topic.
Right click on External Gateways object and select New External Gateway. Enter a name that identifies this gateway.
Select SIP from drop down menu in the Protocol field.
Enter the IP address of the external gateway in the IP Address field.
Select the SIP Profile created earlier from the drop down menu of the SIP Profile field . For more information on configuring the External Gateway object, refer to the External Gateway topic.
Configure Channel Group and External Network Element
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Right click on the Dialogic object and select New Routing Configuration. The Routing Configuration object is a container object and no configuration is needed here. For more information on this object refer to the Routing Configuration topic.
Right click on the Routing Configuration object and select New Channel Groups. The Channel Groups object is a container object for multiple channel groups. No configuration is needed here. For more information refer to Channel Groups topic.
Right click on the Channel Groups object and select New Channel Group. In the Name field, either except the default name or enter a name that identifies the Channel Group being configured.
Select SIP from the drop down menu in the Signaling Type field. For more information on configuring the channel group, refer to the Channel Group topic.
Right click on the SIP Channel Group and select New IP Network Element. Select from drop down menu the gateway configured in the Configure External Gateway section above.
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Right click on the Channel Groups object again and select New Channel Group. Enter a name for this channel group in the Name field.
Select ISDN from the drop down menu of the Signaling Type field.
Select Enabled from the drop down menu of the Multi Level Precedence and Preemption (MLPP) Support field drop down menu. Refer to the Channel Group topic for information on configuring the individual fields in this object.
To finish configuring the ISDN channel group, right click on the channel group and select New Circuit Group. Select the starting and ending spans for this channel group. Refer to the ISDN Circuit Group under Channel Group topic for more information on this object.
Click on the Channel Groups object again. At this point, a yellow exclamation point will be displayed in the Icon. Click on the Download Resource Tables button and the Channel Group configuration will be sent to the IMG 2020.
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