It is is considered as one of the most prominent entity in the VoIP world. Company Digium has created it as a fully innovative approach to telecommunications. This company has delivered such software that enables people to configure a server and start to make calls.
Citel Technologies , A Voice over IP Phone company that provides VoIP Business Phone Systems. Its Main products include EXTender, PBXgateway, Upgraded Hardware Products, PBX platforms etc.