Message Waiting Indicator

The 2020 IMG can accept an incoming SIP NOTIFY request (outside of a subscription) which has the parameters Event type = message summary and Content Type = application/simple-message-summary and interwork these messages into an SS7 network using TCAP messaging. SIP uses the SIP Specific Event Notification (Notify) as a mechanism to transport the MWI message through IP and the 2020 IMG then inter-works the Notify message along with its Event Package Name simple-message-summary to the SS7/outgoing side. The 2020 IMG then receives a response from the SS7 network and inter-works this response to the SIP network and sends the response out in the 200 OK message. This feature supports RFC 3842 section 5.2 only. The MWI feature is supported in both ANSI and ITU protocol.

 

Diagram

DG_MWI_SIP_SS7.png

 

Call Flows

CF_MWI_SIP_SS7.png

Call Trace

Call Trace - MWI

 

Configuration

Initial Configuration

Before configuring, the 2020 IMG must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding onto configuring the SIP Session Timer feature.

 

Configure SIP SGP Profile

Configure a SIP Gateway Profile that allows the Notify message to be sent without a Subscribe message.

  1. Right click on the Profiles Object and select New SIP SGP. Change the SIP Profile ID to something other than ID:0. By doing this, the other fields within the SIP SGP object can now be modified.

  2. In the SIP SGP object enter a name in the SIP Profile Name field to identify this profile.

  3. Click in the Allow NOTIFY w/o Subscription field and select Allow from the drop down menu. See screen capture below.

SC_SGP_MWI_Allow_DisAllow.png

 

Create an External Gateway:

Configure the external gateway that the SIP channel group will send messages to.

  1. Right Click on Dialogic IMG EMS and select New External Network Elements. The External Network Elements object allows multiple external network element objects to be created under it. There is no configuration required in this object. Refer to the External Network Elements topic for more information.

  2. Right Click on External Network Elements object and select New External Gateways. The External Gateways object allows multiple gateway objects to be created under it. There is no configuration required in this object. Refer to the External Gateways topic for more information.

  3. Right Click on External Gateways object and select New External Gateway. Enter a name in the Name field to identify the gateway being created.

  4. Select SIP from drop down menu in the Gateway Signaling Type field.

  5. Enter IP address or host-name in appropriate fields.

  6. In the SIP Profile field the SIP SGP configured earlier can be selected from drop down menu. For more information refer to the External Gateway topic.

SC_SIP_MWI_GW_SEL_Profile.png

 

Create SIP Channel Groups:

  1. Right Click on Dialogic IMG EMS and select New Routing Configuration. See Routing Configuration for more information.

  2. Right Click on Routing Configuration and select New Channel Groups. The Channel Groups object allows multiple channel groups to be created under it. There is no configuration required in this object.

  3. Right Click on Channel Groups object and select New Channel Group. Enter a name to identify this channel group and change the Signaling Type to SIP using the drop down menu. See SIP Channel Group for more information on configuring a SIP channel group.

 

Insert SIP External Network Element into SIP Channel Group:

  1. Right Click on the SIP Channel group created and select New IP Network Element. Within the IP Network Element field, select from drop down menu, the gateway configured earlier. See screen capture below.

SC_MWI_IPNetElem_Config.png

  1. At this point, the Incoming SIP side of the configuration is complete. Follow instructions below to configure the outgoing SS7 side.

 

Configure SS7 Stack:

An SS7 stack must be configured.

  1. Right Click on the Physical IMG object in the object tree and select New Signaling. Refer to Signaling topic for more information

  2. Right Click on the Signaling object just created and select New SS7. An SS7 StandAlone object will get created. See SS7 Signaling topic for more information on configuring this pane.

  3. Right Click on the SS7 StandAlone object created and select New SS7 Stack. An SS7 Stack Pane will get created. Enter the information needed for your specific network. The first part of configuring the 2020 IMG for MWI is to enable SCCP and TCAP signaling in the stack. Select ANSI from drop down menu of both the SCCP and TCAP fields. MWI feature is supported in ANSI only. See SS7 Stack link for more information on configuring the individual fields of the SS7 Stack Pane. See screen capture below.

SC_MWI_SCCP_Enable.png

 

Note: If configuring a service such as CNAM or MWI on multiple 2020 IMG nodes, the SS7 Stack ID's cannot be configured with the same ID. For example, when configuring a 2020 IMG Node 0 with stack ID's 0 and 1, any other 2020 IMG Nodes configured under any Logical Node can not have any of the stacks configured with the same ID's (0 or 1). By doing so, the TCAP services cannot be configured.

 

  1. Right Click on SS7 Stack and select New SS7 Link Set. Enter an Adjacent Point Code. Refer to SS7 Link Set topic for more information on configuring the Link Set.

  2. Right Click on SS7 Link Set and select New SS7 Link. Using drop down menus, enter an Interface - Offset, Channel, SLC and any other information regarding the SS7 Link. Refer to SS7 Link topic for more information on configuring the SS7 Link.

  3. Right Click on SS7 Link Set and select New SS7 Route. Enter the DPC. Refer to SS7 Route topic for more information on configuring the SS7 Route.

  4. Right Click on the SS7 Stack Object created above and select New SCCP/TCAP and the SCCP/TCAP pane gets created. No configuration is done within this pane. This pane will allow you to configure other objects that have to do with SCCP/TCAP. Refer to SCCP/TCAP topic for more information on this pane.

  5. Right Click on the SCCP/TCAP object and select New Subsystem Number. Select a Subsystem Number from the drop down menu.

  6. The Subsystem Number Status is by default set to Prohibited. Using the buttons just below the Subsystem Pane, click on Allow and the status will change to Allowed. Refer to Subsystem Number link for more information on configuration of the Subsystem Number Pane.

  7. Right Click on Subsystem Number and select New Adjacent Translator. Select from drop down menu the Adjacent Point Code that will be used for the Message Waiting Indicator. The point codes in drop down menu are point codes from the DPC of the Route ID. Refer to Adjacent Translator topic for more information.

 

 

Configure GCL Services for SIP to TCAP Interworking:

  1. Right Click on the Logical IMG Object and select New GCL Services. Refer to GCL services topic for more information.

  2. Right Click on GCL Services object and select New SIP-TCAP MWI. In the Subsystem field select from drop down menu the stack that was created earlier. See screen capture below. For more information on the SIP-TCAP MWI (Interworking) object, refer to the SIP-TCAP MWI (Interworking) topic.

SC_MWI_GCL_Stack_Config.png

  1. Once the GCL Service has been created, the new service can be added to the SIP Channel Group created above. Right Click on the SIP Channel Group created above and select New GCL Service. Refer to GCL Service topic for more information.

  2. Select from drop down menu the service that will be associated with this channel group. See screen capture below.

SC_MWI_GCLService_Config.png

 

Configure SS7 Channel Group:

A Channel Group must be configured for the SS7 side. Follow Procedure below to configure the SS7 Channel Group.

  1. Right Click on the Channel Groups Object created above and select New Channel Group. Enter a name for this Channel Group and select SS7 as the signaling type. See the channel group topic for more information on configuring the Channel Group.

  2. Right Click on the Channel Group just created and select New ISUP Group. In the OPC-DPC of the object created, select the correct OPC/DPC form the drop down menu. See screen capture below. The selections below all come from the SS7 Route.

  3. Right Click on the ISUP SS7 Server object and select New Circuits. Select the 2020 IMG Name along with the specific span/channels. Refer to the circuit group topic for more information on configuring the Circuits object.

  4. Configuring the MWI feature has been accomplished. Below is screen capture of the directory tree when finished configuring.

SC_Tree_TCAP_MWI.png

 

Additional Information: