asterisk users - Oct 2007 - Spandsp Fax sent successfully but Asterisk don't terminate the call

Hello,
the bench that gives me a problem is the following:

asterisk1 + spandsp  ===>===PSTN===>=== asterisk2 + spandsp

1) i put a .call file inside Asterisk spool directory
2) the fax is sent successfully, I got this message in the sender's log:
....
[Oct  4 17:57:02] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 8
[Oct  4 17:57:03] DEBUG[17610] app_txfax.c: FLOW FAX Set rx type 0
[Oct  4 17:57:03] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 4
[Oct  4 17:57:04] DEBUG[17610] app_txfax.c: FLOW FAX Set rx type 4
[Oct  4 17:57:04] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 0
[Oct  4 17:57:05] DEBUG[17610] app_txfax.c: FLOW FAX Set rx type 0
[Oct  4 17:57:05] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 4
[Oct  4 17:57:06] DEBUG[17610] app_txfax.c: FLOW FAX Set rx type 0
[Oct  4 17:57:06] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 1
[Oct  4 17:57:07] DEBUG[17610] app_txfax.c: FLOW FAX Set rx type 13
[Oct  4 17:57:07] DEBUG[17610] app_txfax.c: FLOW FAX FAX exchange complete
[Oct  4 17:57:07] DEBUG[17610] app_txfax.c: FLOW FAX Set tx type 13
[Oct  4 17:57:07] DEBUG[17610] app_txfax.c: FLOW FAX FAX exchange complete

3) the fax .tiff file is well created on the rx side
4) But the .call file is never erased by Asterisk, because app_txfax.c never
finish.
Same behavior at the other end for app_rxfax.c, it never finish.
It is as if spandsp did not detect that the fax session was finished.

Nota: I have tried with this bench also, and I got the same behavior : the
app_txfax.c stay inside the while loop :
asterisk1 + spandsp  ===>===PSTN===>=== HW fax

I have tried put some traces inside app_txfax and app_rxfax, and I see well
that both programs are staying inside the while loop without leaving it.
while (ast_waitfor(chan, -1) > -1)
        {
....
        }

Is it a configuration problem, or a bug?
Any help is welcome.

Pirlouwi.
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