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I think the assumption is that the ephemeral client port is typically larger than the static server port and that the client starts the connection (conversation).port.

epan/conversation_table.c - add_conversation_table_data_with_conv_id()

if (src_port > dst_port) {
    addr1 = src;
    addr2 = dst;
    port1 = src_port;
    port2 = dst_port;
} else if (src_port < dst_port) {
    addr2 = src;
    addr1 = dst;
    port2 = src_port;
    port1 = dst_port;
} else if (cmp_address(src, dst) < 0) {
    addr1 = src;
    addr2 = dst;
    port1 = src_port;
    port2 = dst_port;
} else {
    addr2 = src;
    addr1 = dst;
    port2 = src_port;
    port1 = dst_port;
}