Siemens Enterprise OpenStage 40 SIP IP-phone is a great solution for people working in the permanent place. This model features a large display and easy setup of various protocols such as TDM, HFA and SIP.
BT&T TELECOM GROUP CORPORATION is a Delaware, USA company incorporated in 1999. BT&T`s vision is to be a key player in the burgeoning telecom horizon, most especially in the Americas and Asia-Pacific countries.