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The SS7 REL message is very general. The release of a call could be for a number of different reasons. The REL messages on the SIP side such as BYE, and CANCEL try to narrow down the reason a call was released but in some instances does not give enough information. The IMG 2020 has functionality that interworks the diagnostics field information that is embedded in the REL message on the SS7 side and inputs them into the Reason Header's reason-extension field on the SIP side. The feature is enabled or disabled through a field in the SIP_SS7 Interworking object. Refer to the information below.
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