WTP time out!

hi,list:
    I run Kannel1.3.1 as wap gateway on redhat linux 9.0.
When I use a Kyocera mobile(KZ-820/1.0UP.Browser),It always timeout.
but When i Use Nokia Mobile or SaSung Mobile it works well.
is it the problem of Kannel or is there sth wrong with Kyocera Mobile?

the debug info as follows:
.....
.....
2003-08-05 14:16:14 [1] DEBUG: Octet string dump ends.
2003-08-05 14:16:14 [1] INFO: Returning to code page 1 (default).
2003-08-05 14:16:14 [1] DEBUG: WSP: decoded headers:
2003-08-05 14:16:14 [1] DEBUG: Accept: application/vnd.wap.wmlc; type=1108
2003-08-05 14:16:14 [1] DEBUG: Accept: application/vnd.wap.wmlc
2003-08-05 14:16:14 [1] DEBUG: Accept: application/vnd.wap.wmlscriptc
2003-08-05 14:16:14 [1] DEBUG: User-Agent: kyocera-KZ-820/1.0 UP.Browser/4.1.26c4
2003-08-05 14:16:14 [1] DEBUG: Accept-Language: zhch
2003-08-05 14:16:14 [1] DEBUG: Accept: image/png
2003-08-05 14:16:14 [1] DEBUG: Accept: image/vnd.wap.wbmp
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.ringtone; content-type=application/x-qcp; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.ringtone; content-type=application/x-pmd; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.wallpaper; content-type=image/png; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.picture; content-type=image/png; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.audio; content-type=application/x-qcp; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.audio; content-type=application/x-pmd; size=102400
2003-08-05 14:16:14 [1] DEBUG: Accept: application/x-mmc.title; charset=utf-8; size=40
2003-08-05 14:16:14 [1] DEBUG: Accept-Charset: utf-8
2003-08-05 14:16:14 [1] DEBUG: WSP: End of decoded headers.
2003-08-05 14:16:14 [1] DEBUG: WSP 22: New state CONNECTING
2003-08-05 14:16:14 [1] DEBUG: WSP: machine 0x8100128, state CONNECTING, event S-Connect.res
2003-08-05 14:16:14 [1] DEBUG: WSP 22: New state CONNECTING_2
2003-08-05 14:16:14 [5] DEBUG: WTP: resp_machine 51, state RESULT_WAIT, event TR-Result.req.
2003-08-05 14:16:14 [5] DEBUG: WTP 51: New state RESULT_RESP_WAIT
2003-08-05 14:16:21 [4] DEBUG: Timeout-R elapsed.
2003-08-05 14:16:21 [5] DEBUG: WTP: resp_machine 51, state RESULT_RESP_WAIT, event Timeout-R.
2003-08-05 14:16:21 [5] DEBUG: WTP 51: New state RESULT_RESP_WAIT
2003-08-05 14:16:23 [5] DEBUG: WTP: resp_machine 51, state RESULT_RESP_WAIT, event RcvInvoke.
2003-08-05 14:16:23 [5] DEBUG: WTP 51: New state RESULT_RESP_WAIT
2003-08-05 14:16:28 [4] DEBUG: Timeout-R elapsed.
2003-08-05 14:16:28 [5] DEBUG: WTP: resp_machine 51, state RESULT_RESP_WAIT, event Timeout-R.
2003-08-05 14:16:28 [5] DEBUG: WTP 51: New state RESULT_RESP_WAIT
2003-08-05 14:16:35 [5] DEBUG: WTP: resp_machine 51, state RESULT_RESP_WAIT, event RcvInvoke.
2003-08-05 14:16:35 [5] DEBUG: WTP 51: New state RESULT_RESP_WAIT
2003-08-05 14:16:35 [4] DEBUG: Timeout-R elapsed.
......
.....
-08-05 14:17:17 [5] DEBUG: WTP: resp_machine 51, state RESULT_RESP_WAIT, event Timeout-R.
2003-08-05 14:17:17 [5] DEBUG: WTP 51: New state LISTEN
2003-08-05 14:17:17 [1] DEBUG: WSP: machine 0x8100128, state CONNECTING_2, event TR-Abort.ind
2003-08-05 14:17:17 [1] DEBUG: WSP 22: New state NULL_SESSION
2003-08-05 14:17:17 [1] DEBUG: Destroying WSPMachine 0x8100128
2003-08-05 14:17:17 [5] DEBUG: WTP: Destroying WTPRespMachine 0x80f9fc0 (51)
2003-08-05 14:17:30 [5] INFO: WTP_RESP: resp_machine_find_or_create: abort received, yet having no machine