The IAM (Initial Address Message) is sent to a destination endpoint and contains information needed for call setup. Within the IAM message are parameters labeled as Forward Call Indicators (FCI). Forward Call Indicators contain information relating to the characteristics of the connection, signaling path, and called party sent in the forward direction. This is a mandatory parameter in the IAM message which is used in countries that offer CUG (closed user group) service. The FCI Override object functions as explained below.
A call comes into the IMG 2020. This call could be of any protocol and has call setup information to be passed to the outgoing side. The FCI Override object can be configured to translate/modify one or all of the parameters described below.
Forward Call Indicator is set to Ignore, then all setup information received will pass through and be transmitted on the outgoing side.
Forward Call Indicator is set to Override, a default set of values will be automatically set in this object. In this case, when the IMG 2020 receives the incoming message, it will ignore the incoming indicators and default values will be transmitted in the outgoing IAM message.
Forward Call Indicator is set to Override. The user now has the ability to modify any of the indicators displayed in the FCI Override object. The outgoing IAM will consist of any default indicator values as well as any modified indicator values.
Web GUI Page
Dialogic > SS7 > SS7 Network > SS7 Stack > SS7 Destination > ISUP Group > New FCI Override
Maximum Objects
One FCI Override Indicator object per ISUP Group object.
Related Topics and Dependencies
The FCI Override object is created under an specific ISUP Group. The FCI Override object is used to either override or ignore one or all of the FCI parameters in any calls that use this ISUP Group. The complete SS7 network along with all of its objects must first be configured. Once they are configured, the FCI Override can be created and configured. The Default setting of the FCI Override object is to Ignore overriding the parameters.
SS7 - Destination - ISUP Group - BCI Override
Field Descriptions
Forward Call indicator
When the IAM is received, the IMG 2020 can be configured to either ignore or override the incoming FCI parameters. The FCI parameters are then transmitted onto the outgoing leg.
Ignore (Default)- FCI Override is disabled and the IMG 2020 propagates the ISUP information it receives to the outgoing leg.
Override - Values in FCI parameters will be overridden by values selected in corresponding fields below. (Default values that are displayed in the object will be sent if no value was received for a specific indicator)
See Forward Call Indicators Table (SIP to SIP-T Interworking) for bit information on the Forward Call Indicator.
* If FCI Override is set to Override, parameters marked with an asterisk (*) are the default values selected in the FCI Override Pane and will be available in the outbound IAM message.
National/International call indicator
National * - Change the National/International call indicators on the outbound ISUP IAM message to indicate the call is a national call.
International - Change the National/International call indicators on outbound ISUP IAM message to indicate the call is an international call.
Octet 1 | H | G | F | E | D | C | B | A |
Not an incoming national call |
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| 0 |
Incoming National Call |
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| 1 |
End-to-end Method Indicator
No end-to-end method available* - Change the end to end Method Indicator on the outbound ISUP IAM message to No end to end Method Indicator available.
pass along method available - Change the end to end Method Indicator on the outbound ISUP IAM message to pass-along method available.
SCCP method available - Change the end to end Method Indicator on the outbound ISUP IAM message to SCCP method available.
pass-along and SCCP methods available - Change the end to end Method Indicator on the outbound ISUP IAM message to include both the pass-along and SCCP method available.
Octet 1 | H | G | F | E | D | C | B | A |
No end to end method available |
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| 0 | 0 |
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Pass-along method available |
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| 0 | 1 |
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SCCP method available |
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| 1 | 0 |
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Pass-along and SCCP method available |
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| 1 | 1 |
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Interworking Indicator
No interworking encountered* - Change the Interworking Indicator in the outbound ISUP IAM message to No interworking encountered.
interworking encountered - Change the Interworking Indicator in the outbound ISUP IAM message to Interworking encountered.
Octet 1 | H | G | F | E | D | C | B | A |
No Interworking Encountered |
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| 0 |
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Interworking Encountered |
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| 1 |
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Information Indicator
No end-to-end information available* - Change the end to end information indicator on the outbound ISUP IAM message to No end-to-end information will available.
end-to-end information available - Change the end to end information indicator on the outbound ISUP IAM message to allow end-to-end information to be available.
ISUP Indicator
ISUP not used all the way* - Change the ISUP Indicator information on the outbound ISUP IAM message to ISUP not used all the way.
ISUP used all the way - Change the ISUP Indicator information on the outbound ISUP IAM message to ISUP used all the way.
Octet 1 | H | G | F | E | D | C | B | A |
ISUP not used all the way |
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| 0 |
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ISUP used all the way |
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| 1 |
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ISUP preference Indicator
ISUP preferred all the way* - Change the ISUP preference indicator on the outbound ISUP IAM message to ISUP preferred all the way.
ISUP not required all the way - Change the ISUP preference indicator on the outbound ISUP IAM message to ISUP not required all the way.
ISUP required all the way - Change the ISUP preference indicator on the outbound ISUP IAM message to ISUP required all the way.
Octet 1 | H | G | F | E | D | C | B | A |
ISUP Preferred all the way | 0 | 0 |
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ISUP not required all the way | 0 | 1 |
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ISUP required all the way | 1 | 0 |
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Spare | 1 | 1 |
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ISDN Access Indicator
originating access non-ISDN* - Change the ISDN Access indicator on the outbound ISUP IAM message to originating access non-ISDN.
originating access ISDN - Change the ISDN Access indicator on the outbound ISUP IAM message to originating access ISDN.
Octet 2 | H | G | F | E | D | C | B | A |
Originating access non-ISDN |
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| 0 |
Originating access ISDN |
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| 1 |
SCCP Method Indicator
No indication* - Change the SCCP Method Indicator on the outbound ISUP IAM message to no indication on outbound IAM message.
connectionless method available - Change the SCCP Method Indicator on the outbound ISUP IAM message to connectionless method available.
connection oriented method available - Change the SCCP Method Indicator on the outbound ISUP IAM message to connection oriented method available.
connectionless and connection oriented method available - Change the SCCP Method Indicator on the outbound ISUP IAM message to both connection oriented method available and connectionless method available.
Octet 2 | H | G | F | E | D | C | B | A |
No Indication | 0 | 0 |
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Connection-less method available | 0 | 1 |
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Connection-oriented method available | 1 | 0 |
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Connection-less and connection-oriented method available | 1 | 1 |
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