The Calling Party Category is a parameter that distinguishes the station used to originate a call. SIP Support for ISUP Calling Party Category inter-works the Calling Party Category parameter in the SS7 ISUP message to the SIP network. The CPC (Calling Party Category) Parameter is included in either the From: Header or the P-Asserted Identity Header. The CPC also carries other important information that describes the originating party. Interworking of CPC values is supported from the SS7 network to the SIP Network only. See information below on how to configure and map the CPC parameter.
Diagram
The diagram below shows the flow of data from an SS7 Network to an IP network using SIP signaling. The Calling Party Category Parameters in the IAM on the SS7 side are then interworked into the INVITE message on the SIP side. The Calling Party Parameter can be interworked into either the From: Header or the P-Asserted Identity Header.
Call Flow
User Part or Username - Call Trace example
From:unavailable<sip:unavailable;cpc=operator@10.129.39.59>;tag=95ffcd055e0f78f7d5d397020e89288d78a1
Parameter Part - Call Trace example
From:unavailable<sip:unavailable@10.129.39.59;cpc=operator>;tag=95ffcd055e0f78f7d5d397020e89288d78a1
CPC Mapping
The following table shows the mapping of CPCs received from SS7 to CPC sent in SIP message from IMG.
Received CPC | CPC sent out in a SIP message |
Operator, language French | operator |
Operator, language English | operator |
Operator, language German | operator |
Operator, language Russian | operator |
Operator, language Spanish | operator |
Ordinary calling subscriber | ordinary |
Calling subscriber with priority | priority |
Data call (voice band data) | datacall |
Test call | test |
Payphone | payphone |
Configuration
Initial Configuration
The Calling Party Category Parameter is configured in the SIP ISUP CPC Mapping object under the SIP SGP object. The SIP SGP is then inserted into an external network element object. Below are instructions on how to configure the Calling Party Category parameter. Before configuring, the 2020 IMG must have an initial configuration created on it. Before proceeding verify the basic functionalities have already been configured.
Create SIP Profile (SGP) and enable OLI
Create a SIP SGP object. Under the SIP SGP object, the ISUP OLI can be configured.
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.
In the SIP SGP object enter a name in the SIP Profile Name field to identify this profile.
Right click on the SIP SGP object just created and select New SIP ISUP CPC Mapping. A SIP ISUP CPC Mapping object will appear. Refer to IMG 1010 - SIP ISUP CPC Mapping (10.5.1_ER1 and above) topic for information on configuring the object.
Create SIP signaling stack
Right Click on 2020 IMG Name and select New Signaling. The Signaling Object allows multiple signaling objects to be configured below it. No configuration is needed in this object.
Right Click on Signaling Object just created and select New SIP. Select the SIP SGP created above from drop down menu in the Remote IMG's SIP Profile field. For more information refer to the IMG 1010 - SIP Signaling Object topic.
Create an External Gateway
Configure the external gateway that the SIP channel group will send messages to.
Right click on the IMG EMS object 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 IMG 1010 - External Network Elements topic for more information.
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 IMG 1010 - External Gateways topic for more information.
Right click on External Gateways object and select New External Gateway. Enter a name in the Name field to identify the gateway being created.
Select SIP from drop down menu in the Gateway Signaling Protocol field.
Enter an IP address for this gateway.
In the SIP Profile field the SIP SGP configured earlier can be selected from drop down menu.
Create SIP Channel Groups
Right click on the IMG EMS object and select New Routing Configuration. Refer to the IMG 1010 - Routing Configuration Object topic for more information.
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. Refer to the IMG 1010 - Channel Groups topic for more information on this object.
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. Refer to the IMG 1010 - Channel Group topic for more information on configuring a SIP channel group.
Insert SIP External Network Element into SIP Channel Group
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.