Comment 1 for bug 325787

I have the same problem as you

I have a fresh install of ubuntu 9.04, with :
* libspandsp1 0.0.5~pre4-1
* asterisk-app-fax 0.0.20070624-2ubuntu1

And each time I get a fax, RxFax is called and crashes Asterisk, I can see the last error:
    -- AGI Script Executing Application: (RxFAX) Options: (/tmp/asterisk_faxreceive.sourcerh.00007.00001.gEKVnS/fax.tiff)
asterisk: symbol lookup error: /usr/lib/asterisk/modules/app_rxfax.so: undefined symbol: t30_set_local_ident
Died at /usr/share/asterisk/agi-bin/receive_fax line 233, <stdin> line 21.

As a result I think asterisk-app-fax has been compiled with a wrong version of libspandsp

In fact, i've found somewhere this link which reports the compilation of asterisk-spandsp-plugins_0.0.20070624-2 as a success
http://www.linux-m32r.org/pipermail/build-status/Week-of-Mon-20080922/171649.html

However it shows warnings:
app_rxfax.c:288: warning: implicit declaration of function 't30_set_local_ident'

The compilation is thought to be good, but not at all, because it generates error when using RxFax

So I hope Ubuntu will upgrade soon compatible versions of asterisk-app-fax and libspandsp1, because for now, it's unusable...