IM-SSFIP (Internet Protocol) Multimedia Service Switching Function
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By supporting both legacy 2G/3G networks and next-gen 4G LTE networks simultaneously, the Tango Networks portfolio enables service providers to efficiently migrate their networks to IMS/VoLTE without requiring an IM-SSF (IMS/IN Gateway) or IMS Centralized Services.
The the IP Multimedia Subsystem (IMS)capability, called the IP Multimedia - Services Switching Function (IM-SSF), provides the inter-working of the SIP message to the corresponding CAMEL, ANSI-41, Intelligent Network Application Protocol (INAP) or Transaction Capabilities Application Part (TCAP) messages, allowing carriers to combine next-generation and existing service platforms, the company claims.