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IMSupportInternally, Opal transports IM as frames of T.140 text data encapsulated as per RFC 4103 Over SIP, Opal supports 4 messaging types: - RFC 3428 page mode using MESSAGE requests outside a call - RFC 3428 session mode using MESSAGE requests inside a call - RFC 4975 MSRP (partially supported) signalled using "message" SIP type with transport "tcp/msrp" - Page mode using MESSAGE requested, but signalled using "message" SDP type with transport "sip" |