Tierzero Voice is a SIP softclient that extends your Tierzero Service beyond the land line or desk top. It brings features of the Tierzero platform directly to end-users mobile devices as a Unified Communications solution. Users are able to maintain the same identity when making or receiving calls from any location, regardless of device. They are also able to seamlessly transition an ongoing call from one device to another and continue that call without interruption. Tierzero Voice App grants users the ability to manage contacts, voicemail, call history and configurations in a single location. This includes the management of answering rules. greetings, and presence which all contribute to efficient communication.