asterisk users - Oct 2009 - Lancom 1722 and Asterisk (i need HELP)

Hello,

i have a big problem...

i want to connect my asterisk server to a lancom 1722 device (ISDN/SIP) Gateway.

sip.conf:
[general]
context=default
allowguest=yes
realm=10.1.1.209
bindport=5060
bindaddr=0.0.0.0
tos_sip=cs3      ; f?r SIP-Pakete (Kommunikationsaufbau)
tos_audio=ef     ; f?r RTP-Audio-Pakete
tos_video=af41   ; f?r RTP-Video-Pakete
allow=all
dtmfmode=rfc2833
canreinvite=yes

[3000]
type=friend
secret=3000
qualify=yes
host=dynamic

[lancom]
type=friend
context=fax-in
secret=1000
username=1000
fromuser=1000
port=5060

i added a sip-line in my lancom, but it doesn't connect. does anybody know
how to configure it??

would be nice, if somebody have experience with lancom and asterisk.

when i create a call with asterisk to lancom, this message appear:
and-fax*CLI> console dial 1001
[Oct  6 13:39:29] WARNING[3551]: chan_oss.c:686 setformat: Unable to re-open DSP
device /dev/dsp: No such file or directory
    -- Executing [1001 at default:1] Dial("Console/dsp",
"SIP/1001 at lancom") in new stack
    -- Called 1001 at lancom
    -- Got SIP response 500 "resource shortage" back from 10.1.3.29
    -- SIP/lancom-083e4070 is circuit-busy
  == Everyone is busy/congested at this time (1:0/1/0)
  == Auto fallthrough, channel 'Console/dsp' status is
'CONGESTION'
 << Hangup on console >>

Greets
Thomas
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