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The IMG 2020 can accept an incoming SIP NOTIFY request (outside of a subscription) which has the parameters Event type = message summary and Content Type = application/simple-message-summary and interwork these messages into an SS7 network using TCAP messaging. SIP uses the SIP Specific Event Notification (Notify) as a mechanism to transport the MWI message through IP and the IMG 2020 then inter-works the Notify message along with its Event Package Name simple-message-summary to the SS7/outgoing side. The IMG 2020 then receives a response from the SS7 network and inter-works this response to the SIP network and sends the response out in the 200 OK message. This feature supports RFC 3842 section 5.2 only. The MWI feature is supported in both ANSI and ITU protocol.
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