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ATCF and E-CSCF integrated with P-CSCF : In this case IMS-AGW would act as ATGW (and also since the SBC5xx0 acts as integrated P-CSCF and IMS-AGW, sonus Ribbon ATCF/ATGW solution would also be integrated in same box i.e ATGW interface is NOT exposed externally).
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At a high level, the functions performed by the ATCF are:
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