[Ekiga-list] Could not register (failed)

["Dpto. de" Tecnología - IES El Parador <info tecnoparador es>]

I have just configured Softphone Ekiga 3.2.7 with Ubuntu 10.10, and I
get always the same error message: "Could not register sip:XXX".

My debug output with -d 4 reads:

        2011/02/16 22:54:33.672   0:00.079
        Version 3.2.7 by  on Unix Linux (2.6.35-25-generic-i686) with
        PTLib (v2.6.7) at 2011/2/16 22:54:33.672
        2011/02/16 22:54:33.672   0:00.079                        Ekiga
        git revision: unknown
        2011/02/16 22:54:33.676   0:00.083                        Ekiga
        registered on D-Bus: org.ekiga.Ekiga
        
After getting the stack backtrace with gdb, the output is:

        GNU gdb (GDB) 7.2-ubuntu
        Copyright (C) 2010 Free Software Foundation, Inc.
        License GPLv3+: GNU GPL version 3 or later
        <http://gnu.org/licenses/gpl.html>
        This is free software: you are free to change and redistribute
        it.
        There is NO WARRANTY, to the extent permitted by law.  Type
        "show copying"
        and "show warranty" for details.
        This GDB was configured as "i686-linux-gnu".
        Para las instrucciones de informe de errores, vea:
        <http://www.gnu.org/software/gdb/bugs/>...
        Leyendo símbolos desde /usr/bin/ekiga...(no se encontraron
        símbolos de depuración)hecho.
        (gdb) run
        Starting program: /usr/bin/ekiga 
        aviso: the debug information found in
        "/usr/lib/debug//usr/lib/libxml2.so.2.7.7" does not match
        "/usr/lib/libxml2.so.2" (CRC mismatch).
        
        aviso: the debug information found in
        "/usr/lib/debug/usr/lib/libxml2.so.2.7.7" does not match
        "/usr/lib/libxml2.so.2" (CRC mismatch).
        
        [Depuración de hilo usando libthread_db enabled]
        [Nuevo Thread 0xb7fcab70 (LWP 3890)]
        [Thread 0xb7fcab70 (LWP 3890) terminado]
        
        Program exited normally.
        (gdb) thread apply all bt
        (gdb) quit
        
Could anybody help me?