Problem with DAHDI

Hi,

i have FreePBX 3.211.63-8 and want to configure an ISDN Backup (Trunk: DAHDI).

The DAHDI configuration looks good (i think):

dahdi show channels:
Chan Extension Context Language MOH Interpret Blocked State
pseudo default default In Service
1 from-pstn en default In Service
2 from-pstn en default In Service

dahdi show status:
Description Alarms IRQ bpviol CRC Fra Codi Options LBO
HFC-S PCI A ISDN card 0 [TE] OK 0 0 0 CCS AMI 0 db (CSU)/0-133 feet (DSX-1)

dahdi show version:
DAHDI Version: 2.6.1 Echo Canceller: HWEC, OSLEC

When i do an outgoing call via DAHDI, i get the following error messages:

[2013-05-22 11:00:11] ERROR[1610]: chan_dahdi.c:14666 dahdi_pri_error: PRI Span: 1 Unable to receive TEI from network in state 3(Establish awaiting TEI)!

and

-- Span 1: Channel 0/1 got hangup, cause 18
-- Executing [[email protected]:23] NoOp("SIP/10-00000002", "Dial failed for some reason with DIALSTATUS = CHANUNAVAIL and HANGUPCAUSE = 18") in new stack

Any ideas?

Best Regards,
Lukas

Any ideas?

???