asterisk users - Jan 2006 - No translator path: iax2 calls not possible

Hello !

Asterisk 1.0.9  running on Linux 2.6.12.
I'm not able to call iax2 channels. There can be no translation path
found.
When I try to call from a ZAP PRI channel the following error occurs:

channel.c:1891 ast_request: No translator path exists for channel type 
IAX2 (native 63488) to 72

dial_exec: Unable to create channel of type 'IAX2'

What is wrong ?

Here is my iax.conf:

[general]
bindport=4569
language=de
disallow=all
jitterbuffer=no
tos=lowdelay

[iax-test1]
type=friend
username=iax-test1
secret=xxxxxx
context=from_IAX
host=dynamic
qualify=yes
allow=alaw
allow=ulaw


Thanks for your help !

Hans