SIP to SS7 ISUP Interworking: Calling Party Category

Overview:

Feature 1295 SIP Support for ISUP Calling Party's Category interworks the Calling Party's Category in the SS7 ISUP message to the SIP network. Interworking of CPC values is supported from the SS7 network to the SIP Network only. The Calling Party Category is a parameter that distinguish the station used to originate a call. The CPC carries other important information that describes the originating party. When interworking the Calling Party Parameter from SS7 to SIP the Calling Party Category value can be added in two places.

 

User Part or Username:

From:unavailable<sip:unavailable;cpc=operator@10.129.39.59>;tag=95ffcd055e0f78f7d5d397020e89288d78a1

 

Parameter Part:

From:unavailable<sip:unavailable@10.129.39.59;cpc=operator>;tag=95ffcd055e0f78f7d5d397020e89288d78a1

 

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.

 

 image96.gif

 

Configuration:

If neither option is selected, the IMG sends out an INVITE message without any CPC parameter regardless of whether the IAM message is received with or without CPC parameter.

You can also configure how the IMG responds when it receives unmapped CPC parameters of spare, unknown, or reserved. The options are:

 

Unmapped CPCs received from SS7 can be ignored or be passed in SIP message as decimal value. This is configurable.

 

Call Flow:

CF_SS7-SIP-CPC.png

 

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