If your Internet connectivity requires a guaranteed minimum bandwidth (including upstream traffic) or service level agreements (e.g. guaranteed "uptime", unlike most ADSL broadband connectivity), then there are a number of options available, depending upon location and budget.

Wanwise would be delighted to discuss these options and investigate the appropriate solution on your behalf, including whether or not to have a "managed" gateway router/firewall provided by the Telco, or to maintain full control internally within the business (e.g. for VPN connections and traffic shaping).