Can I have a nested form inside a remote form with Rails 3?

Question

Hello,

I am trying to build a remote form_for form for my customer model that has a nested field for my phone number model. I do not know ahead of time how many phone numbers will be submitted for each customer. No matter what I do, I can't get this form to submit correctly or pass the right params.

Here's what I have right now (view is HAML) in estimates/new:

= form_for(Customer.new, :remote => true) do |customer_form|
  = customer_form.text_field :last_name
  = customer_form.text_field :first_name
  = customer_form.fields_for :phone_numbers do |phone_form|
    = phone_form.text_field :number

Customers controller:

class CustomersController < ApplicationController

    def new
        @customer = Customer.new
    end

    def create
        @customer = Customer.new(params[:customer])
        if @customer.save
           session[:customer_id] = @customer.id
        else
           flash[:error] = "Estimate could not be saved!"
        end
    end

end

PhoneNumbers controller:

class PhoneNumbersController < ApplicationController
    def create
        @phone_number = PhoneNumber.new(params[:phone_number])
        @phone_number.save
        render :nothing => true
    end
end

Customer model:

class Customer < ActiveRecord::Base
    has_many :estimates
    has_many :phone_numbers
    accepts_nested_attributes_for :phone_numbers
end

PhoneNumber model:

class PhoneNumber < ActiveRecord::Base
    belongs_to :customer
end

So, my question is: Can I have a nested form inside a remote form with Rails 3? How would I even do this? Has the syntax for this changed in Rails 3?

Thanks.