IMG 1010 - CIC and DAI Codes - SS7 ISUP to SIP

SIP Carrier Identification Code (CIC) and Dial Around Indicator Code (DAI)

Overview

The IMG supports the Interworking of the ISUP IAM Carrier Identification Code (CIC) and Dial Around Indicator (DAI) parameter to the R-URI of the SIP INVITE. The CIC and DAI parameter is enabled through the SIP SGP Profile Pane in Clientview. See the R-URI Header Tags description in the SIP SGP Profile pane (IMG 1010 - SIP Profile - 10.5.3) for more information.

Carrier Identification Code: CIC

The CIC parameter consists of a three or four digit code which identifies information sent in the forward direction to a transit network. This parameter indicates the specific transit network selected by the originating subscriber. The CIC parameter is carried in the SIP INVITE request R-URI and maps to the Carrier Identification Parameter (CIP) or Transit Network Selection (TNS) Parameter in the ISUP IAM and vice-versa.

Dial Around Indicator: DAI

The DAI is included in the SIP INVITE request R-URI which identifies how the carrier in the Carrier Identification Code is chosen. The DAI parameter is carried in the SIP R-URI and maps to the Carrier Selection Information (CSI) Parameter in the ISUP IAM and vice-versa. Below is a table of the ISUP CSI and its corresponding value in SIP DAI.

If the presubUnkwn-da or operator DAI are received they will be mapped to ISUP CSI 0x00 (No Indication)

Example: (SIP INVITE with CIC and DAI information)

INVITE sip:044;cic=6789;dai=presub@10.129.39.60:5060 SIP/2.0

Call Flows

SS7 to SIP

This call flow demonstrates that when the IMG receives an ISUP IAM request from the PSTN/SS7 which has the Carrier Identification (CIP) and Carrier Selection Information (CSI) Parameters included in the IAM message. These will be interworked to the cic and dai parameters of the SIP URI of the INVITE request.

Open

SIP to SS7 ANSI

This call flow demonstrates that when the IMG receives a SIP INVITE R-URI containing the ‘cic’ and 'dai' parameters, it will be interworked to the CIP and CSI of the ISUP IAM.

Open

SIP to SS7 ITU

This call flow demonstrates that when the IMG receives a SIP INVITE R-URI containing the ‘cic’ tag, that the IMG will interwork an IAM ISUP request to the SS7 ITU side with the Transit Network Selection.

SIP to SIP

The call flow below demonstrates that when the IMG is doing something like transcoding that the 'cic' and 'dai' values are passed through the IMG transparently.

Troubleshooting

If experiencing problems with this feature, verify the following:

• Verify the CIC is selected in the R-URI Header Tags field of the SIP SGP.

• Verify the correct SGP is assigned to the External Gateway.

• Verify the incoming IAM contains a value in the CIP or TNS for IMG to pass this value in the SIP INVITE. The IMG forwards the cic parameter only if it appears in the format below: