BSMI interprets undecoded Q.931 packets from the network, removing information not needed by most applications and making it available via an L3L4m message. If you need specific Q.931 information not delivered with the message but that is documented as contained in a Q.931 packet, such as call setup messages which have two IEs (Information Elements) – Lower and Higher level compatibilities, you can get access to the entire undecoded packet via an L3L4mRAW_QDATA message (see the BSMI section of the Bfv API Reference Manual, Volume 5, for details). Raw data for Q.931 packets that are not even processed by BSMI in the first place and for Q.931 packets containing user-defined ISDN messages is also notified via this message.

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