Peer-to-peer SIP call with Android SIP Stack?

Question

I have been looking for a way to set up the Android SIP stack to be able to establish a SIP call between two devices on the same network, in an ad-hoc manner. i.e without REGIST

Answer 1

You can do this with CSipSimple, which is open source: http://code.google.com/p/csipsimple/

You set up local accounts, register to yourself instead of a server, then make a phone call using TXT mode and dial remote_account_name@remote_ip_address.