Trixbox: SIP/2.0 489 Bad event Error on incoming calls

hi,
i have this really wierd and annoying error. we have obtained a sip trunk from Siminn Iceland Ltd provider and set it up with trixbox. the trunk can register with the service provider just fine. i can set the trunk as a peer/friend ( type = peer or type = friend and setup incoming context and type = user) i am able to make outbound calls through it. but as soon as i set it up like that all the incoming call is rejected by asterisk and from the console i can see it is a "SIP/2.0 489 Bad event" msg generated by asterisk. if i get rid of all the "type" command from the trunk setup, i can receive calls just as fine. but obviously that stops me from calling outbound through the trunk.
the configuration for receiving making outgoing call is like this:
[siminn]
host=157.157.16.140
username=2000053544990160
secret=somePassword
user=phone
type=friend
register string:
2000053544990160: somePassword@157.157.16.140/2000053544990160
in this configuration if i receive an incoming call, this is what i see on the asterisk console:
trixbox1*CLI>
<--- SIP read from 157.157.16.140:5060 --->
INVITE sip:2000053544990160@202.176.88.148 SIP/2.0
Via: SIP/2.0/UDP 157.157.16.140:5060;branch=z9hG4bK4912b162-8587-5936
Call-Id: CI_430507_2000053544990160@1eaaaaaaa271_404041
From: "" ;tag=157.157.16.140-8587-1495
To:
Max-Forwards: 70
CSeq: 430507 INVITE
Contact:
Content-Length: 0
<------------->
--- (9 headers 0 lines) ---
Sending to 157.157.16.140 : 5060 (no NAT)
Using INVITE request as basis request - CI_430507_2000053544990160@1eaaaaaaa271_404041
Found peer 'simin'
trixbox1*CLI>
<--- Reliably Transmitting (no NAT) to 157.157.16.140:5060 --->
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 157.157.16.140:5060;branch=z9hG4bK4912b162-8587-5936;received=157.157.16.140
From: "" ;tag=157.157.16.140-8587-1495
To: ;tag=as5c42a171
Call-ID: CI_430507_2000053544990160@1eaaaaaaa271_404041
CSeq: 430507 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Proxy-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="39194225"
Content-Length: 0
<------------>
Scheduling destruction of SIP dialog 'CI_430507_2000053544990160@1eaaaaaaa271_404041' in 32000 ms (Method: INVITE)
trixbox1*CLI>
<--- SIP read from 157.157.16.140:5060 --->
ACK sip:2000053544990160@202.176.88.148 SIP/2.0
Via: SIP/2.0/UDP 157.157.16.140:5060;branch=z9hG4bK4912b162-8587-5936
Call-Id: CI_430507_2000053544990160@1eaaaaaaa271_404041
From: "" ;tag=157.157.16.140-8587-1495
To: ;tag=as5c42a171
CSeq: 430507 ACK
Content-Length: 0
<------------->
--- (7 headers 0 lines) ---
trixbox1*CLI>
<--- SIP read from 157.157.16.140:5060 --->
NOTIFY sip:2000053544990160@202.176.88.148 SIP/2.0
Via: SIP/2.0/UDP 157.157.16.140:5060;branch=z9hG4bK4912b162-9032-9620
Call-Id: CI_291719_2000053544990160@1eaaaaaaa271_274688
From: sip:2000053544990160@194.144.220.247:1105;tag=157.157.16.140-4294965200-8974
To: sip:2000053544990160@194.144.220.247:1105
Max-Forwards: 70
CSeq: 219 NOTIFY
Contact:
Subscription-State: active
Content-Type: application/simple-message-summary
Event: message-summary
Content-Length: 42
Messages-Waiting: no
Voice-Message: 0/0
<------------->
--- (12 headers 2 lines) ---
trixbox1*CLI>
<--- Transmitting (no NAT) to 157.157.16.140:5060 --->
SIP/2.0 489 Bad event
Via: SIP/2.0/UDP 157.157.16.140:5060;branch=z9hG4bK4912b162-9032-9620;received=157.157.16.140
From: sip:2000053544990160@194.144.220.247:1105;tag=157.157.16.140-4294965200-8974
To: sip:2000053544990160@194.144.220.247:1105;tag=as3b0ed1c9
Call-ID: CI_291719_2000053544990160@1eaaaaaaa271_274688
CSeq: 219 NOTIFY
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
ontent-Length: 0
but if i change the configuration to the following, i can receive calls, but it will stop me from making outbound calls because no peer is defined:
[siminn]
host=157.157.16.140
username=2000053544990160
secret=somePassword
user=phone
register string:
2000053544990160: somePassword@157.157.16.140/2000053544990160
i have also tried splitting it into two parts (type = peer and type = user). but did not help.
anyone have any idea?
khan