(gdb) bt
#0  0x001a0d96 in my_SQLPrepare (hstmt=0x8f21be0, szSqlStr=0x0, cbSqlStr=0)
    at prepare.c:97
#1  0x001a0f7b in SQLPrepare (hstmt=0x0, szSqlStr=0x0, cbSqlStr=0)
    at prepare.c:59
#2  0x001398f2 in SQLPrepare () from /usr/lib/libodbc.so.1
#3  0x00abfb2d in messagecount (mailbox=0x8ec0fac "1001@from-sip",
    newmsgs=0xb7af6fb4, oldmsgs=0xb7af6fb8) at app_voicemail.c:2044
#4  0x004c7657 in do_monitor (data=0x0) at chan_sip.c:11360
#5  0x00d8e371 in start_thread () from /lib/tls/libpthread.so.0
#6  0x00c089be in clone () from /lib/tls/libc.so.6
(gdb)

Restart...

(gdb) bt
#0  0x00482d96 in my_SQLPrepare (hstmt=0x97add50, szSqlStr=0x0, cbSqlStr=0)
    at prepare.c:97
#1  0x00482f7b in SQLPrepare (hstmt=0x0, szSqlStr=0x0, cbSqlStr=0)
    at prepare.c:59
#2  0x001388f2 in SQLPrepare () from /usr/lib/libodbc.so.1
#3  0x0081db2d in messagecount (mailbox=0x974afac "1001@from-sip",
    newmsgs=0xb7a6cfb4, oldmsgs=0xb7a6cfb8) at app_voicemail.c:2044
#4  0x00235657 in do_monitor (data=0x0) at chan_sip.c:11360
#5  0x00d8e371 in start_thread () from /lib/tls/libpthread.so.0
#6  0x00c089be in clone () from /lib/tls/libc.so.6
(gdb)