Adicionaly this is the output on the FS console
freeswitch@testa> *** glibc detected *** /opt/freeswitch/bin/freeswitch: munmap_chunk(): invalid pointer: 0xad60327c ***
======= Backtrace: =========
/lib/libc.so.6[0xb7ad5026]
/opt/freeswitch/mod/mod_voicemail.so[0xad79c228]
/opt/freeswitch/lib/libfreeswitch.so.1(switch_event_deliver+0x61)[0xb7e1d3b3]
/opt/freeswitch/lib/libfreeswitch.so.1[0xb7e1d101]
/opt/freeswitch/lib/libfreeswitch.so.1[0xb7e61086]
/lib/libpthread.so.0[0xb7be614b]
/lib/libc.so.6(clone+0x5e)[0xb7b3020e]
======= Memory map: ========