I need to make a voice and video calls using SIP. I don't know, which SIP Stack choose, because application must be closed-source, but all quite good stacks are distributed under GPL license. I thinking about using JAIN - SIP stack, but I'm not sure if it is sufficiently complete and whether it can be easily implemented in Android. Anybody know a better way? I found this topic -> Looking for a SIP Stack for Android (I don't want use SIP Android API and care about free way)
Regards.