ACK sent too soon?

Hi -

There seems to be an interesting behavior with the SIP stack where if 
the application
sends an ACK too quickly (upon getting back 200-OK after sending 
INVITE), it
seems the client side dialog state hasn't been updated yet from EARLY to 
CONFIRMED
as a result of the 200-OK, so the ACK sending attempt gets this error:
   
    javax.sip.SipException: Bad dialog state Early Dialog

The application code that executes upon reception of the 200-OK looks 
like this:

            Thread.sleep(100);
            Request ack = dialog.createRequest(Request.ACK);
            parent.addAuthorizations(callId.getCallId(), ack);
            dialog.sendAck(ack);

For the scenario where the error happens, the trace is below - if the 
sleep timer is changed from 100 to 1000 the error didn't happen.

Any hints appreciated!
Thanks,
Becky

PS. The nist stack (latest 1.2) used here was a snapshot from early June 
timeframe.

--------------------------------------------------------------------

<!-- Use the Trace Viewer in src/tools/tracesviewer to view this trace  
Here are the stack configuration properties  
javax.sip.IP_ADDRESS= 172.16.40.38 
javax.sip.STACK_NAME= testAgent 
javax.sip.ROUTER_PATH= null 
javax.sip.OUTBOUND_PROXY= null 
javax.sip.RETRANSMISSION_FILTER= null 
--> 
<description 
logDescription="testAgent" 
name="172.16.40.38" /> 
 
<message 
from="172.16.40.38:5060"  
to="172.16.100.164:5060"  
time="1157425082618"  
isSender="true"  
transactionId="z9hg4bke489cea93bff84317a12ef358d20c0dd"  
callId="[email protected]" 
<mailto:[email protected]%22>;  
firstLine="INVITE sip:[email protected] <mailto:[email protected]> 
SIP/2.0"  
debugLine="42"  
 > 
<![CDATA[INVITE sip:[email protected] <mailto:[email protected]> 
SIP/2.0 
Call-ID: [email protected] 
<mailto:[email protected]> 
CSeq: 1 INVITE 
From: <sip:[email protected]>;tag=1968514642 
<mailto:[email protected]%3E;tag=1968514642> 
To: <sip:[email protected] <mailto:[email protected]>> 
Via: SIP/2.0/UDP 
172.16.40.38:5060;branch=z9hG4bKe489cea93bff84317a12ef358d20c0dd 
Max-Forwards: 70 
Contact: <sip:[email protected]:5060;transport=udp;lr 
<mailto:[email protected]:5060;transport=udp;lr>> 
Route: <sip:172.16.100.164:5060;transport=tcp;lr> 
Content-Length: 0 
 
]]> 
</message> 
 
<message 
from="172.16.100.164:1314"  
to="172.16.40.38:5060"  
time="1157425082712"  
isSender="false"  
statusMessage="before processing"  
transactionId="z9hg4bke489cea93bff84317a12ef358d20c0dd"  
firstLine="SIP/2.0 100 Trying"  
callId="[email protected]" 
<mailto:[email protected]%22>;  
debugLine="83"  
 > 
<![CDATA[SIP/2.0 100 Trying 
Via: SIP/2.0/UDP 
172.16.40.38:5060;branch=z9hG4bKe489cea93bff84317a12ef358d20c0dd 
From: <sip:[email protected]>;tag=1968514642 
<mailto:[email protected]%3E;tag=1968514642> 
To: <sip:[email protected] <mailto:[email protected]>> 
Call-ID: [email protected] 
<mailto:[email protected]> 
CSeq: 1 INVITE 
Contact: <sip:172.16.100.164;transport=udp> 
Content-Length: 0 
 
]]> 
</message> 
 
<message 
from="172.16.100.164:1314"  
to="172.16.40.38:5060"  
time="1157425082727"  
isSender="false"  
statusMessage="before processing"  
transactionId="z9hg4bke489cea93bff84317a12ef358d20c0dd"  
firstLine="SIP/2.0 180 Ringing"  
callId="[email protected]" 
<mailto:[email protected]%22>;  
debugLine="125"  
 > 
<![CDATA[SIP/2.0 180 Ringing 
Via: SIP/2.0/UDP 
172.16.40.38:5060;branch=z9hG4bKe489cea93bff84317a12ef358d20c0dd 
From: <sip:[email protected]>;tag=1968514642 
<mailto:[email protected]%3E;tag=1968514642> 
To: <sip:[email protected] <mailto:[email protected]>> 
Call-ID: [email protected] 
<mailto:[email protected]> 
CSeq: 1 INVITE 
Contact: <sip:172.16.100.164;transport=udp> 
Content-Length: 0 
 
]]> 
</message> 
 
<message 
from="172.16.100.164:1314"  
to="172.16.40.38:5060"  
time="1157425083087"  
isSender="false"  
statusMessage="before processing"  
transactionId="z9hg4bke489cea93bff84317a12ef358d20c0dd"  
firstLine="SIP/2.0 200 Ok"  
callId="[email protected]" 
<mailto:[email protected]%22>;  
debugLine="190"  
 > 
<![CDATA[SIP/2.0 200 Ok 
Via: SIP/2.0/UDP 
172.16.40.38:5060;branch=z9hG4bKe489cea93bff84317a12ef358d20c0dd 
From: <sip:[email protected]>;tag=1968514642 
<mailto:[email protected]%3E;tag=1968514642> 
To: <sip:[email protected]>;tag=ds-3106-2cb5 
<mailto:[email protected]%3E;tag=ds-3106-2cb5> 
Call-ID: [email protected] 
<mailto:[email protected]> 
CSeq: 1 INVITE 
Content-Type: application/sdp 
Contact: <sip:[email protected]:5060;transport=udp 
<mailto:[email protected]:5060;transport=udp>> 
Allow: INVITE,ACK,BYE,CANCEL,NOTIFY,INFO,OPTIONS 
Supported: 
User-Agent: Nuance/-b058-win2k 
Content-Length: 201 
 
]]> 
</message>