Word on the street has it that we don't actually interop with GTalk for audio calls any more. We should fix that.

Relatedly, from jingle/incoming-basics.py:

        # With gtalk4, apparently we have to send transport-accept immediately,
        # not even just before we send our transport-info.
        # FIXME: wjt thinks this is suspicious. It matches the Gabble
        #        implementation, so he moved it here to avoid the test being
        #        racy, but we should do some more interop testing.

And in outgoing-basics.py:

    if jp.dialect == 'gtalk-v0.4':
        node = jp.SetIq(jt2.peer, jt2.jid, [
            jp.Jingle(jt2.sid, jt2.peer, 'transport-accept', [
                jp.TransportGoogleP2P() ]) ])
        stream.send(jp.xml(node))

    # FIXME: expect transport-info, then if we're gtalk3, send
    # candidates, and check that gabble resends transport-info as
    # candidates