conference bridge questions

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Hi,
    I have some questions about conference bridge when play with pjsipua.

    If we want to create a four party audio conference, is it needed to
connect all channels each other?

    connect(0, 1);
    connect(0, 2);
    connect(0, 3);
    connect(1, 0);
    ...
    connect(1,3);
    connect(2,0);
    ...
    connect(2,3);
    ...
    connect(3,2);

    or just all the ports connected to port zero and port zero connected to
all ports is enough.

    And it seems pjsipua create conference bridge by default, even for a
simple call.
    The conference bridge has 120ms(buffer size 6 * ptime 20 ms) latency.A
simple call will be total 240ms latency caused by
    both side bridge. Is it true?
    How could I reduce latency for pjsipua?


regards,
Gang
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