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.
Speedflow is a provider of high-quality VoIP (A-Z Wholesale, CLI routes, CC routes) and SMS services. The company offers VoIP software solutions (MediaCore SBC, AccuCore ERP) and custom software development services.