I am a long time user of sipdroid and managed to get both my sip accounts, with Gizmo5 and callcentric working with linphone as well. No such luck with 3CXPhone for Android. I follow the instructions that are available online, but when I return from the profile save screen to the dailer screen I get a brief message saying "Registering" and then moments later "Not Registered". During all this the 3G data active icon never indicated any activity on the 3G connection. 3G is enabled in 3CX. Callcentric Settings are: User: 1777XXXXXXX (my username) Password: XXXXXXXXX Internal Server: External Server: callcentric.com STUN Server: stun.3CX.com Advanced: Proxy: callcentric.com Port: 5060 Registration Timeout: 1800 Keep-Alive Interval: 60 DMTF Method: RFC-2833 Enable NAT: No Enable ICE: No Integration: Lock Wifi: Never Proximity Sensor: No Enable 3G: Yes Redirect Normal Calls: No Log Call Records: No Record Calls: No Audio Settings: Echo Cancellation: No Silence Detection: No Play Buffer: -1 Record Buffer: -1 Mic Gain: 1 Audio Codecs: G.711 (uLaw): Yes G.711 (aLaw): Yes GSM: Yes Speex: No Phone Specs: HTC Magic w/ 1.5 Anyone here have any ideas why it says that it is registering, but it is obviously not accessing the internet. Also, tried at home on wifi and still no success. Callcentric is a recommended service provider to 3CX and it does not work, but then it does not work with any other service provider either. Am I missing something in the setup?