[asterisk-ss7] how does APC work in libss7?

[Lamont]

hi,

    libss7 can configure adjpointcode(APC), is a third point code except
opc and dpc. But as we know, there are only OPC and DPC in msu,  I confused
that where to place the APC, and  how it work. I google for so long, but
can not found any answer.

    Can anyone give me more info about APC? Thx very much.
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