Problem mit AVM C4

Es handelt sich, der Titel sagt's, um eine AVM C4, die direkt am Anlagenanschluss hängt. Sobald eine Verbindung aufgebaut werden soll bekommen wir einen "protocol error layer 2"

Laut AVM Support ist die Karte korrekt für den Anschluss konfiguriert - was bei der doch recht übersichtlichen conf-File nicht wirklich schwer ist. ;)

Wir haben schon allmöglichen Kram probiert. Vom Wechseln der Kabel bis hin zum Wechsel des Betriebssystems - bis jetzt ohne sichtbaren Erfolg.

Hat jemand eine Idee, woran das liegen könnte? Idealer Weise direkt mit Lösungsansatz?

Der Vollständigkeit halber noch die capi.conf und der Output einer Testverbindung per pppd:

/etc/capi.conf
card file proto io irq mem cardnr options
c4 c4.bin DSS1 - - - - P2P
c4 - DSS1 - - - - P2P
c4 - DSS1 - - - - P2P
c4 - DSS1 - - - - P2P

Output von pppd
ast-pbx:/etc/asterisk # pppd call isdn/avm usepeerdns
Plugin userpass.so loaded.
userpass: $Revision: 1.5 $
Plugin capiplugin.so loaded.
capiplugin: $Revision: 1.36 $
capiconn: 1.13
capiplugin: phase serialconn.
capiplugin: contr=1
capiplugin: contr=1
capiplugin: contr=1
capiplugin: contr=1
controller 1: listen_change_state 0 -> 1
controller 1: listen_change_state state=1 event=1 ????
controller 1: listen_change_state state=1 event=1 ????
controller 1: listen_change_state state=1 event=1 ????
contr 1: listenconf Info=0x0000 (No additional information) infomask=0x144 cipmask=0x0 capimask2=0x0
controller 1: listen_change_state 1 -> 0
plci_change_state:0x0 0 -> 1 event=1
capiplugin: dialing 03039984330 (hdlc)
contr 1: listenconf Info=0x0000 (No additional information) infomask=0x144 cipmask=0x0 capimask2=0x0
controller 1: listen_change_state state=0 event=3 ????
contr 1: listenconf Info=0x0000 (No additional information) infomask=0x144 cipmask=0x0 capimask2=0x0
controller 1: listen_change_state state=0 event=3 ????
contr 1: listenconf Info=0x0000 (No additional information) infomask=0x144 cipmask=0x0 capimask2=0x0
controller 1: listen_change_state state=0 event=3 ????
plci_change_state:0x101 1 -> 2 event=3
DISCONNECT_IND reason 0x3302 (Protocol error layer 2) for plci 0x101
plci_change_state:0x101 2 -> 8 event=9
plci_change_state:0x101 8 -> 0 event=11
capiplugin: disconnect(remote): "" -> "03039984330" outgoing (pcli=0x101/ncci=0x0) 0x3302 (0x0000) - Protocol error layer 2
plci_change_state:0x0 0 -> 1 event=1
capiplugin: dialing 03039984330 (hdlc)
plci_change_state:0x101 1 -> 2 event=3
DISCONNECT_IND reason 0x3302 (Protocol error layer 2) for plci 0x101
plci_change_state:0x101 2 -> 8 event=9
plci_change_state:0x101 8 -> 0 event=11
capiplugin: disconnect(remote): "" -> "03039984330" outgoing (pcli=0x101/ncci=0x0) 0x3302 (0x0000) - Protocol error layer 2
plci_change_state:0x0 0 -> 1 event=1
capiplugin: dialing 03039984330 (hdlc)
plci_change_state:0x101 1 -> 2 event=3
DISCONNECT_IND reason 0x3302 (Protocol error layer 2) for plci 0x101
plci_change_state:0x101 2 -> 8 event=9
plci_change_state:0x101 8 -> 0 event=11
capiplugin: disconnect(remote): "" -> "03039984330" outgoing (pcli=0x101/ncci=0x0) 0x3302 (0x0000) - Protocol error layer 2
plci_change_state:0x0 0 -> 1 event=1
capiplugin: dialing 03039984330 (hdlc)
plci_change_state:0x101 1 -> 2 event=3
DISCONNECT_IND reason 0x3302 (Protocol error layer 2) for plci 0x101
plci_change_state:0x101 2 -> 8 event=9
plci_change_state:0x101 8 -> 0 event=11
capiplugin: disconnect(remote): "" -> "03039984330" outgoing (pcli=0x101/ncci=0x0) 0x3302 (0x0000) - Protocol error layer 2
capiplugin: couldn't make connection after 4 retries
controller 1: listen_change_state 0 -> 1
controller 1: listen_change_state state=1 event=1 ????
controller 1: listen_change_state state=1 event=1 ????
controller 1: listen_change_state state=1 event=1 ????
contr 1: listenconf Info=0x0000 (No additional information) infomask=0x144 cipmask=0x0 capimask2=0x0
controller 1: listen_change_state 1 -> 0
capiplugin: exit