@mprotic maybe @advocatux have right. I explain. The actual version on Pulseaudio and BlueZ in xenial:

BlueZ
xenial (16.04LTS) (admin): Bluetooth tools and daemons
5.37-0ubuntu5.1 [security]: amd64 i386
5.37-0ubuntu5 [ports]: arm64 armhf powerpc ppc64el s390x

PulseAudio
xenial (16.04LTS) (sound): PulseAudio sound server
1:8.0-0ubuntu3: amd64 arm64 armhf i386 powerpc ppc64el s390x

The correct release notes of actual Xenial PulseAudio are 8.0. We should are track and find from v5 pulseaudio to actual xenial to try to find if make something new to support all this types of devices.

UPDATE: In this release yet make some commits for this issue: https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/6.0/

UPDATE 2: Talk about oFono 1.13 and apply this patch for this function: https://lists.freedesktop.org/archives/pulseaudio-discuss/2015-February/023102.html

Same situation to the actual BlueZ version for xenial.

And finally will see if oFono support or can handle somethig whit this versions.

What do you think?