asterisk users - Oct 2004 - sipgate cannot dial out / loop detected

Hi all,
I have troubles getting outgoing calls to work with sipgate. Tried all
possible constellations, copied posted configs, nothing. Registration or
incoming calls never a problem. If I use a SIP phone from my network it
works. * doesn't.

I always get 482 Loop Detected
--------------------------
    -- Starting simple switch on 'Zap/2-1'
    -- Executing SetCallerID("Zap/2-1", ""8004277"
<8004277>") in new stack
    -- Executing Dial("Zap/2-1", "SIP/$(EXTEN:3)@sipgate")
in new stack
    -- Called $(EXTEN:3)@sipgate
    -- Got SIP response 482 "Loop Detected" back from 217.10.79.9
    -- Now forwarding Zap/2-1 to 'Local/$(EXTEN:3)@sipincoming' (thanks
to
SIP/sipgate-92b0)
Oct 16 12:36:29 NOTICE[278554]: chan_local.c:374 local_alloc: No such
extension/context sipincoming@$(EXTEN:3) creating local channel
Oct 16 12:36:29 NOTICE[278554]: app_dial.c:232 wait_for_answer: Unable to
create local channel for call forward to 'Local/$(EXTEN:3)@sipincoming'
  == Everyone is busy/congested at this time
    -- Executing Hangup("Zap/2-1", "") in new stack
  == Spawn extension (default, 92010000, 3) exited non-zero on 'Zap/2-1'
    -- Hungup 'Zap/2-1'
----------------------------
Below my current configs. What am I doing wrong?


-----------------------------------
sip.conf

[general]
port=5060
bindaddr=192.168.1.9
externip=xxxxxx.dyndns.org
localnet=192.168.1.0/255.255.255.0
context=sipincoming
srvlookup=yes
tos=reliability
disallow=all
allow=ulaw
allow=alaw
allow=gsm

register => 8004277:xxxxxxxx@sipgate.de/8004277

[sipgate]
type=friend
username=8004277
secret=xxxxxx
host=sipgate.de
insecure=very
nat=yes
canreinvite=no
fromuser=8004277
fromdomain=sipgate.net


-------------------------------------
extensions.conf

exten => _920.,1,SetCallerID("8004277" <8004277>)
exten => _920.,2,Dial(SIP/$(EXTEN:3)@sipgate)
exten => _920.,3,Hangup
---
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On Sat, 16 Oct 2004, Christoph Kampka wrote:
> exten => _920.,2,Dial(SIP/$(EXTEN:3)@sipgate)
${EXTEN:3}