Implemenation of SIP on android platform 2.1

I want to work on SIP and Android. I am supposed to make it possible for two users to call eachother using iptel.org. One way to do this, I can use the demo provided with 2.3 but it needs a real device. As I don't have a real device, I wan't t开发者_StackOverflow中文版o work at 2.1 platform. I am a beginner, so I need a good step to start so that it would be easy for me to complete it.

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PJSIP ( http://www.pjsip.org/) is a good and portable SIP framework. It doesn't still have support for android (even if it is just a matter of time) but you could check out this : http://code.google.com/p/csipsimple/ that is android SIP support built on PJSIP.

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Android 2.1 doesn't have built-in support for SIP so you have to find a third party library.

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JAIN-SIP http://jsip.java.net/ is also a very good SIP-Stack including a reference implementation of the SIP API. It works on great on Android <= 2.2.

Here's (http://groups.google.com/group/mobicents-public/browse_thread/thread/e38fbdd874083d49/4fdb4123419e7a74) a nice discussion with further information.