The trend moves towards to VoIP ready mobile phones. At present, existing transmission technologies such as WiMAX or WCDMA do not cover every location. In order to be able for today's use of the advantages of Internet telephony and VoIP technology with mobile phones, CYTEL Software GmbH presents at CeBIT 2007 the new version of the VoIP PABX CYTEL.iBX.> The German Vendor CYTEL Software GmbH integrates the coM.sat PCI GSM board into the VoIP PABX, which merges mobile telephones as an adequate internal extension and makes ISDN/analog lines thereby redundant. Call redirection between several mobile phones are possible without difficulties, the same way as setting up phone calls using the IP connection between branches or ITSP (Internet Telephony Service Provider). Also the combination between GSM, fixed net and IP-Telephony is possible with CYTEL.iBX. With the step into the mobile convergent market CYTEL's slogan of the CeBIT 2007 "VoIP goes mobile" becomes more than fairly.