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Overview:
The ISUP OLI (also know as II digits) parameter includes information that is used for carriers to determine the origin of a call. This information gets lost over SIP networks if not inter-worked properly. This feature allows carrying ANSI ISUP OLI Parameter from traditional TDM network into SIP and vice versa.
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You enable this feature using the SIP From Header Tags Pane. See IMG 1010 - SIP From: Header Tags (10.5.1_ER1 and above) for more details. When this option is enabled, the IMG will include the INFO digits received in the Originating Line Info parameter (OLI) in the IAM message from the SS7 ANSI side into the ISUP_OLI tag in the From Header on the SIP side, and vice versa.
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