function isTelephoneNumber(object, params)
{
    if(params['allow_empty'] && params['allow_empty'] == 'true' && object.value == '')
    {
        return true;
    }

	var inputstr = object.value;

	var regex = /^[+]{0,1}[\d \(\)]*$/;

	if(regex.test(inputstr))
	{
		return true;
	}
	else
	{
		return false;
	}
}