Tier 2 product phone support can be added to any product sold at VoIP Discount Warehouse. Tier 2 product phone support gives you a call back from a systems engineer within 8 business hours. With tier 2 support you get a total of 45 minutes of phone support on the product associated with the support. Note: Business hours are defined as 8-5 Monday through Friday, no Holidays. Phone support is on the associated product only not any other system the product may be attaching to.