I have noticed that there is not only a very old version of PSI in the stable tree (0.14-r4), but also the current ~arch version don't support PSI+ (extras use flag) The git version that has extras works for me with and it installs psi-plus. The only problem I have voice calls are impossible. The jingle use flag is there but it seems to be erroneous because the application has no voice call option anywhere.
Seems like a deliberate choice not to expose experimental features to release, but I will leave this to new maintainer - Rion, should we close this?
Andreas, you are right. This is my point too. Previously Psi+ project lived its own life. Now I maintain both and all the stable stuff was moved to Psi already. But probably I'll add one day a possibility to build Psi+ tag from 9999 version. It's beyond the scope of this bug though. Voice calls should get a huge update for the next major release. PS: probably I have to change my name to something real =)
