MP -> Aterisk calls issue

[Pascal Laurent]

Hi,

I'm trying to call an extension (1009) on my asterisk server from the
MP. I'm getting this error whenever I dial the number:

The MP side
===========
-- Executing [1009@phones:1] Dial("SIP/9000-0058b178",
"SIP/10...@10.3.1.2") in new stack
-- Called 10...@10.2.1.2
[Jan 2 10:01:23] WARNING[1088]: chan_sip.c:12016
handle_response_invite: Received response: "Forbidden" from '"at530"
<sip:90...@169.254.0.1>;tag=as39264dd1'
-- SIP/10.2.1.2-00588148 is circuit-busy
== Everyone is busy/congested at this time (1:0/1/0)
== Auto fallthrough, channel 'SIP/9000-0058b178' status is 'CONGESTION'

The Asterisk Server Side
====================
NOTICE[2536]: chan_sip.c:14778 handle_request_invite: Failed to
authenticate user "at530" <sip:90...@169.254.0.1>;tag=as39264dd1

Where does at530 user coming from? I could not reach the MP from the
asterisk server, could that be the reason for this authentication
failure?

sip.conf on the MP
===============
[ast]
type=peer
username=ast
;fromuser=ast
secret=password
context=phones
disallow=all
qualify=500
dtmfmode=rfc2833
callerid=server
canreinvite=no
insecure=port,invite
host=10.3.1.2
;allow=gsm:80
allow=ulaw

sip.conf on the asterisk server
========================
[ast]
type=peer
username=ast
;fromuser=ast
secret=password
context=phones
disallow=all
qualify=500
dtmfmode=rfc2833
callerid=server
canreinvite=no
insecure=port,invite
host=10.0.0.2
;allow=gsm:80
allow=ulaw

Thanks,
--Pascal