There is a new integration mechanism between Telepathy and signon coming up with KDE Applications 15.08. I have been building KTp from live packages and did not see this working last time I tried. I have been working to get this working so I will create a couple of bugs related to the specific things I did. Reproducible: Always
I have kde-apps 15.08 installed and indeed ktp is not usable in this state. One of the developer states in kde bug report bug https://bugs.kde.org/show_bug.cgi?id=351375 that telepathy-accounts-signon is a crucial part of ktp.
See-Also: https://bugs.kde.org/show_bug.cgi?id=351785
Thanks for reporting. This is fixed in git now. Please sync. https://gitweb.gentoo.org/proj/kde.git/commit/?id=3539f8b299ce77476b54bc448bd58ded088bd4d8