The phone system in my wife's small business needs an upgrade to newer technology. I have the following information with needs - * 3x extensions that need to be replaced with a sip client on their mobile devices * These extensions and voice minutes must be bundled together at a fixed cost per month. Bundle must be for mins * I would like a 2 to 1 call concurrency ratio * Need 3x numbers ported * We have 20mb/10mb fibre link * Need some sort of SLA in case there's a problem * I would prefer a month to month solution