Local with international Phone No validation in ASP.NET

jQuery international phone number validaiton method for jquery.validate.js

$.validator.addMethod('phone', function(value) {
var numbers = value.split(/\d/).length - 1;
return (10 <= numbers && numbers <= 20 && value.match(/^(\+){0,1}(\d|\s|\(|\)){10,20}$/)); }, 'Please enter a valid phone number');