Siemens Building Technologies has announced a reseller agreement to offer CoVi Technologies' Crystal HD high-definition, Internet protocol (IP) network-based video surveillance systems in the US. The companies also announced that the Crystal HD system is being integrated with Siemens SiPass security monitoring interface. Developed by Siemens Building Technologies, SiPass enables security personnel to control and monitor facilities from a central workstation. CoVi is based in Austin, Texas. Siemens Building Technologies, with US headquarters in Norcross, Ga., is an operating group of Siemens AG.