TCAP CNAM Database Queries

Overview:

When making a call there are instances where the calling party's name is not in the incoming IAM message. For these instances, feature F-1662 TCAP CNAM Queries for ISUP to SIP Calls' was developed. When this feature is configured/invoked the 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. Feature F-1662 gives the called party or application the ability to access the Calling Parties number if needed. This feature is being added in software version 10.5.3 and supports TCAP ANSI. This feature is supported on calls going from SS7 to SIP. Since TCAP is not supported on the IMG 1004, this feature is restricted to the IMG 1010 and is not supported on the IMG 1004. For more information on this feature, see information below.

 

Diagram:

dg_f-1662_ss7_sip_cnam_query.png

 

  1. The IMG processes the incoming IAM message. The IMG will determine 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.

Note: 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_f-1662_cnam_query.png

Call Trace:

Click HERE to view a Call Trace of the CNAM database queries

 

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"

 

 

Related Topics:

TCAP/CNAM Configuration - SS7 to SIP

Subsystem Number ClientView Pane

SCCP/TCAP ClientView Pane

GCL Services

SIP-TCAP Interworking ClientView Pane

Adjacent Translator ClientView Pane

Channel Group Service ClientView Pane

SS7 Route ClientView Panel