Chan_mobile And Nokie E51 = Noise

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I’m playing with * for about 12 years now and since about 10 years, it’s my home PBX. I can do pretty much everything I want but one thing I
haven’t managed yet… Mobile connection via bluetooth… I’m still using a Nokia E51 and the setup and everything works fine. However, on the second or third call, the incoming audio is noise. I have tried alignmentdetection=yes and also forcemaster but it doesn’t make a difference.

That’s my bt-dongle:

home:~ # hwinfo –bluetooth
02: USB 00.0: 11500 Bluetooth Device
[Created at usb.122]
Unique ID: CiZ2.nQKjiuCfL84
Parent ID: uIhY.kllrQr_lFX9
SysFS ID: /devices/pci0000:00/0000:00:02.0/usb3/3-3/3-3:1.0
SysFS BusID: 3-3:1.0
Hardware Class: bluetooth
Model: “Cambridge Silicon Radio Bluetooth Dongle (HCI mode)”
Hotplug: USB
Vendor: usb 0x0a12 “Cambridge Silicon Radio, Ltd”
Device: usb 0x0001 “Bluetooth Dongle (HCI mode)”
Revision: “31.64”
Driver: “btusb”
Driver Modules: “btusb”
Speed: 12 Mbps
Module Alias: “usb:v0A12p0001d3164dcE0dsc01dp01icE0isc01ip01in00”
Driver Info #0:
Driver Status: btusb is active
Driver Activation Cmd: “modprobe btusb”
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #1 (Hub)

I tried with a different bt-dongle with the same results.

Additionally, I recently started getting this message in the syslog –
and quite a lot of those:

Jan 26 20:06:22 home kernel: [3023015.007826] Bluetooth: hci0 SCO packet for unknown connection handle 65328

Mobile integration is the last bit that my * is missing before being the perfect PBX, so I hope, somebody here could help me with that :).