7970 hangs on requests

Hi,
We write a service that runs on the 7970 phones, and have noticed that on occasion the phone hangs on a request to our server.
It will clear itself in about 20 or so seconds, but we are trying to improve the performance.
This is reproducible in the field with call managers with large systems, and on our local test system where we use the call manager simulator directly attached to the same switch as the application server it is communicating with.
We have had no problem with these same requests being made from browsers over the same network - there are multiple interfaces that reference the same application, full browser based, pda "simple web" based, and phone based - the phone is the only problem point. We are confident that our server is responding in a timely fashion.
Wireshark was used to capture packets and the results of three hangs have been condensed into one file with a couple of extra lines of info on each side of the incident to make sure that the entire sequence is captured - in truth this was from a much longer test period, but if you look at times the grouping is obvious - 1-11, 12-23 and 24 to 34. That file is attached. 23.128.25.211 is the application server running tomcat, and 23.128.25.39 is the IP Phone in the attached file.
What happens is that [SYN] commands are repeatedly sent, about 1.5 seconds apart, they fail about a half dozen times, then either the user represses the button - which is seen in the first two hangs in the file. If the request times out, the sequence number increases, and the request is passed.
We would be very interested in hearing suggestions on how to fine tune the system, and any information on why requests seem to go into this blocked state. To our untrained eyes it looks like the phone is not receiving an [ACK] reply that it expects, but we could use some low level TCP-IP advice on this.
Thank you,
Keith

This is happening with 8.3, so not a firmware issue.
Here's one phone's info, with the Wireshark log from Germany. The event is at lines 392-399 of the log.
MAC Address 001B2A8XXXXX
Host Name SEP001B2AXXXXX
Phone DN 8496XXXX
App Load ID Jar70sccp.8-3-0-50.sbn
Boot Load ID 7970_020706_cert.bin
Version SCCP70.8-3-1S
Expansion Module 1
Expansion Module 2
Hardware Revision 1.3
Serial Number FCH1106A5DN
Model Number CP-7970G
Message Waiting No
UDI phone
Cisco IP Phone 7970G, Global
CP-7970G
V01
FCH1106A5DN
Time 15:36:58
Time Zone W. Europe Standard/Daylight Time
Date 22/10/07
Note: We have upgraded the firmware for the phones on our test system as well. We use call manager simulator, not CM on it. These logs were generated on a system with a full CM attached, though the service requests do not pass though it.

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