TCAP CNAM Database Queries

When making a call there are instances where the calling party's name is not in the incoming IAM message. For these instances, the TCAP CNAM Queries for ISUP to SIP Calls feature was developed. When this feature is configured/invoked the 2020 IMG will examine the incoming IAM and determine whether to do a CNAM Database lookup to determine the calling party's name. Once the calling party's name is found in the CNAM database it will be inter-worked into the From: header in the SIP INVITE message. The TCAP CNAM Database Queries feature gives the called party or application the ability to access the Calling Parties number if needed. This feature supports TCAP ANSI and is supported on calls going from SS7 to SIP. Refer to the TCAP/CNAM Configuration information below on how to configure using the ClientView application.

 

Diagram

DG_CNAM_Query_SS7_SIP.png

  1. The 2020 IMG processes the incoming IAM message and determines whether or not a CNAM query is required. (Calling Party must be 10 digits and Nature Of Address must be national number or unique national number).

  2. If a CNAM query is required, the TCAP CNAM Service will be invoked to make a CNAM Query to the CNAM database.

  3. Once the response from the CNAM database is received, the information is processed within the IMG/GCEMS and eventually sent out in the outgoing SIP INVITE message with the calling party's name in the From: Header.

Note: If the calling party's number is not present in the IAM, then the SIP INVITE will contain unavailable in the From Header. If the calling party's information is not to be divulged, then the SIP INVITE will contain Anonymous in the From Header.

 

Call Flow Diagram

CF_CNAM_Query.png

 

Call Trace

To view Call Trace click on the Call Trace of CNAM Database Query topic.

 

Additional Information

IAM Presentation TCAP Presentation SIP From: Header
Allowed (0x00) Allowed (0x00) Calling Name
Allowed (0x00) Restricted (0x01) Calling Name
Allowed (0x00) Blocking Toggle (0x02) Calling Name
Allowed (0x00) No Indication (0x03) Calling Name
Restricted (0x01) N/A No Query launched "private"
Blocking Toggle (0x02) Allowed (0x00) "private"
Blocking Toggle (0x02) Restricted (0x01) Calling Name
Blocking Toggle (0x02) Blocking Toggle (0x02) "unavailable"
Blocking Toggle (0x02) No Indication (0x03) "unavailable"
No Indication or No Generic Number in IAM Allowed (0x00) Calling Name
No Indication or No Generic Number in IAM Restricted (0x01) "private"
No Indication or No Generic Number in IAM Blocking Toggle (0x02) "unavailable"
No Indication or No Generic Number in IAM No Indication (0x03) "unavailable"

 

Configuration

Initial Configuration

The procedure below explains how to configure the 2020 IMG to initiate CNAM database queries. Verify the following entities are configured before proceeding:

Configure these initial objects before proceeding to the procedure below.

Note: When configuring the CNAM feature with SS7 Redundancy, verify the SS7 stack which utilizes the GCL services is configured on the primary SS7 node.

 

Configure the SS7 Stack and enable TCAP and SCCP on the stack.

An SS7 stack must get configured. The CNAM feature will utilize each SS7 stack that has SCCP and TCAP enabled. Follow instructions below to configure a stack to be used by the CNAM Query feature.

  1. Right Click on the IMG Name object in the object tree of ClientView and select New Signaling. Refer to the Signaling topic for more information on configuring this topic.
  2.  Right Click on the Signaling object created and select New SS7. An SS7 StandAlone object will get created. Refer to the SS7 Standalone topic for more information on configuring this topic.
  3. Right Click on the SS7 StandAlone object created and select New SS7 Stack. An SS7 Stack Pane will get created. Enter the SS7 Stack information such as point codes etc. Refer to SS7 Stack topic. To configure the 2020 IMG to execute a CNAM Database Query, enable SCCP and TCAP signaling in the stack. Select ANSI from drop down menu of both the SCCP and TCAP fields. See screen capture below.

SC_CNAM_Config_SS7_Stack.png

Note: If configuring a service such as CNAM or MWI on multiple nodes, the SS7 Stack ID's cannot be configured with the same ID. For example, when configuring a node with stack ID's 0 and 1 on it, any other nodes configured (Whether the node is configured in or out of the Logical Node group) can not have the same stack ID of 0 or 1.

  1. The 2020 IMG will allow configuring up to 4 stacks for the CNAM Query feature. Configure any other stacks needed.

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

  3. 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 the SS7 Link topic for more information on configuring this object.

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

  5. 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 the SCCP/TCAP topic for more information on this pane.

  6. Right Click on the SCCP/TCAP object and select New Subsystem Number. Select a Subsystem Number and SSN Name from the drop down menu. The Subsystem Number Status is by default set to Prohibited. Using the buttons just below the Subsystem Pane, hit Allow and the status will change to Allowed. Refer to the Subsystem Number topic for more information on configuring this topic.

  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 CNAM database. The point codes in drop down menu are point codes from the DPC of the Route ID.

Configure GCL Services for SIP to TCAP Interworking

  1. Right Click on the IMG Name Object and select New GCL Services. Refer to the GCL Services topic for more information on configuring this object.

  2. Right Click on the GCL Services Object and select New GCL Service. Refer to the GCL Service topic for more information on configuring this object.

  3. Right Click on GCL Service object and select New SIP - TCAP CNAM. In the Subsystem field select from drop down menu the stack that was created earlier. See screen capture below. Refer to the SIP-TCAP CNAM topic for more information on configuring this object.

SC_CNAM_SIP_ChGrp_Service.png

 

Note: CNAM services are limited to total number of TCAP SS7 stacks configured.

 

Configure incoming SS7 Channel Group

Configure the SS7 Channel group that will utilize the CNAM Query feature.

  1. Right click on IMG EMS, and select New Routing Configuration. The Routing Configuration Pane gets created. Refer to the Routing Configuration topic for more information on configuring this object.

  2. Right click on the Routing Configuration Object and select New Channel Groups. Refer to the Channel Groups topic for more information on configuring this object.

  3. Right click on Channel Groups pane and select New Channel Group. A Channel Group Pane appears. Enter the following:

Refer to the Channel Group topic for more information on configuring the rest of this pane.

  1. Right Click on the Channel Group just created and select New ISUP Group. In the OPC-DPC field of the object created, select the correct OPC/DPC from the drop down menu. This drop down menu will display all the SS7 stacks configured. Select from the list, the correct origination and Destination point codes. Refer to the ISUP Group-ANSI topic for more information on configuring this object.

  2. Right Click on the ISUP SS7 Server object and select New Circuits. Select the IMG Name along with the specific span/channels. Please refer to the Circuit Group topic for more information on configuring this object.

 

Configure outgoing SIP Channel Group

Configure the outgoing SIP channel group. This channel group will be the channel group the calling party number will go out on.

  1. Right click on Channel Groups pane created earlier and select New Channel Group. A Channel Group Pane appears. Enter the following:

 

Configure an External Network Element

The external network element being configured below is the gateway that the call will eventually be sent to. The external network element can be either an external gateway or the 2020 IMG itself. The procedure below describes configuring an external gateway.

  1. Right Click on IMG EMS and select New External Network Elements. An external network elements object appears. No configuration needs to be accomplished under this object. This object is a placeholder for multiple External Network Elements.

  2. Right click on External Network Elements and select New External Gateways. An external gateways object appears. No configuration needs to be accomplished under this object. This object is a placeholder for multiple External Gateways.

  3. Right Click on the External Gateways object and select New External Gateway.

Refer to the External Gateway topic for more information on configuring this object. See screen capture below:

SC_CNAM_Ext_Gateway.png

 

Configure an IP Network Element

Go back to the SIP channel group and configure an IP Network element that the SIP channel group will communicate with. This IP network element will be the Gateway that was just configured above.

  1. Right Click on the SIP Channel group created above and select New IP Network Element. An IP Network Element will appear. The IP Network Element field will have the external gateway just created above. Select the Gateway configured above. See screen capture below.

SC_CNAM_ExternalNetworkElement_ChGrp.png

 

Configure the CNAM Service under SIP Channel Group

  1. Right Click on the SIP Channel Group Pane and select New GCL Service. The pane that appears will have the CNAM service that was configured above under GCL services. Select the correct service from drop down menu. Below is screen capture of the service pane created.

SC_CNAM_SIP_ChGrp_Service.png

  1. This completes the outgoing SIP channel group configuration. The configuration is now complete. Below is screen capture of the ClientView tree created while configuring this feature.

SC_Tree_CNAM_Configuration.png