def rpc_reply(channel, original_headers, message, properties=None):
	"""
	Reply to a RPC request. This function will use the default exchange, to directly contact the reply_to queue.

	Parameters
	----------
	channel: object
		Properly initialized AMQP channel to use.
	original_headers: dict
		The headers of the originating message that caused this reply.
	message: string
		Message to reply with
	properties: dict
		Properties to set on message. This parameter is optional, but if set, at least the following options must be set:
			content_type: string - what content_type to specify, default is 'text/plain'.
			delivery_mode: int - what delivery_mode to use. By default message are not persistent, but this can be
				set by specifying PERSISTENT_MESSAGE .
	"""
	if not properties:
		properties = {}
	properties['correlation_id'] = original_headers.correlation_id

	publish_message(channel, '', original_headers.reply_to, message, properties)