Bluetooth headset and ofono

Hello,

I have trouble getting my bluetooth headset to work with ofono and pulseaudio.
My mobile phones connect without problems and work fine.

First, I do not have a modem in my system, so I installed phonesim. Bluez Version
is 5.23 (Debian unstable), pulseaudio and ofono are compiled from current git.
When I run phonesim and power on the modem I see that UUID 0x111f is available.
When I power on my headset (which is already paired and trusted and HSP works
OK with the pulseaudio native backend) it is connected, but I cannot use the HFP
profile. Log messages from ofono are:

plugins/hfp_ag_bluez5.c:profile_new_connection() Profile handler NewConnection plugins/hfp_ag_bluez5.c:profile_new_connection() /org/bluez/hci0/dev_0C_E0_E4_31_23_2D plugins/hfp_ag_bluez5.c:profile_new_connection() Picked modem 0x1d64640 for emulator
src/emulator.c:ofono_emulator_create() modem: 0x1d64640, type: 1 src/emulator.c:ofono_emulator_register() 0x1d52220, 14

And when I disconnect the headset, I get:

src/emulator.c:emulator_disconnect() 0x1d52220 src/emulator.c:emulator_unregister() 0x1d52220 src/emulator.c:emulator_remove() atom: 0x1d669c0 plugins/hfp_ag_bluez5.c:io_hup_cb() Remove /org/bluez/hci0/dev_0C_E0_E4_31_23_2D plugins/hfp_ag_bluez5.c:connection_destroy() fd 15

I see no D-Bus messages at all, I would expect something similar to the messages
I get when I connect my mobile. Headset is a Plantronics Backbeat Pro.

In pulseaudio the headset turns up, but only the a2dp profile is useable. The a2dp profile
is connected after HFP. When I try to switch to HFP, pulsaudio says the HFP profile is not
connected.

Any idea what I am doing wrong?

Regards
Georg