Hi, I have a sip2sip.info account which is working fine with sipdroid 1.6.1 and also on fring, but I am having trouble configuring 3cx for android. These are my sip details: username - 223344#### (hashes vare four numbers) Domain - sip2sip.info Proxy- proxy.sipthor.net Xcap root - https://xcap.sipthor.net/xcap-root (don't know where to put this) I tried various combinations, entered my above username in the user field, proper password in password, sip2sip.info in the external server and proxy in the proxy server. Then I reversed the servers... 3cx says registration failed... In sipdroid I enter user and pass in the obvious fields and enter proxy.sipthor.net in the 'server/proxy' field and sip2sip.info in tthe domain field and I can send and receive calls ok. In fring I enter 223344....@sip2sip.info in the user field and proxy.sipthor.net in the proxy field and it also works fine. Btw I am on a android 1.6 tablet over wifi. Plewse help. Thanks.