SIPdroid: True mobile VoIP calls from your Android phone

Frustrated with a lack of real voice over IP services on your Android phone? Until now, the only VoIP apps for Android have used your standard calling minutes. That goes for Voxofon, Truphone, Skype, and iSkoot. (any others?) Now, when you download SIPdroid from the Android Market, you can finally make calls using your phone's WiFi connection. (And if you download the full version from the SIPdroid website, you can even make calls over 3G!)

To use SIPdroid, you must have an account with any SIP provider, like Gizmo5 for example.

Because SIPdroid was released by i-p-tel GmbH, and is currently in public beta testing, it works best when used in conjunction with i-p-tel's free service PBXes. Apparently, this is the route you must take if you use any of the popular Betamax services such as VoipBuster, VoipCheap, InternetCalls, VoipStunt, SIPdiscount and others.

The SIPdroid Wiki currently lacks instructions for newbies, but jashsu from the xda-developers forum has a detailed SIPdroid primer and Christophe from the SmartPhoneFrance Wiki has posted step-by-step instructions on making it work using PBXes.

Call quality was a bit quieter than standard calls, with a slight delay, but this will vary depending on your SIP provider. Overall it's very usable. A DID number is handy for receiving incoming calls.

Geek trick: call your own phone number from SIPdroid. Answer the incoming call and be amused as you listen to your voice echoing over and over!