Comment 2 for bug 1335119

Apparently, the reason is due to apparmor denying these protocols to be visible (on a side note, none of the others can connect for the same reason). If I boot with apparmor=0 in the kernel line, all protocols appear. These can be found in syslog:
Jun 27 19:55:20 alia kernel: [ 1142.179652] type=1400 audit(1403891720.295:89): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libdbus-1.so.3.7.6" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.190849] type=1400 audit(1403891720.307:90): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libpthread-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.190998] type=1400 audit(1403891720.307:91): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libc-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.191154] type=1400 audit(1403891720.307:92): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/librt-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.193241] type=1400 audit(1403891720.311:93): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libresolv-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.193346] type=1400 audit(1403891720.311:94): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libdl-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.193493] type=1400 audit(1403891720.311:95): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libm-2.19.so" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.202491] type=1400 audit(1403891720.319:96): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libuuid.so.1.3.0" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.247933] type=1400 audit(1403891720.363:97): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libudev.so.1.3.5" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001
Jun 27 19:55:20 alia kernel: [ 1142.248042] type=1400 audit(1403891720.363:98): apparmor="ALLOWED" operation="file_mmap" profile="/usr/lib/telepathy/telepathy-*" name="/lib
/x86_64-linux-gnu/libcgmanager.so.0.0.0" pid=4148 comm="telepathy-gabbl" requested_mask="m" denied_mask="m" fsuid=1001 ouid=1001